The file `util.rs` contained only a single helper function for use in
the `graph_impl` module. This commit changes four (and only four) small
things to remove this file:
  1. add a replacement helper function to `src/graph_impl/mod.rs`
  2. point `src/graph_impl/mod.rs` and its submodule
     `src/graph_impl/stable_graph/mod.rs` to use the new function.
  3. remove the `mod util;` line from the crate root.
  4. remove the `src/util.rs` file from the repository.

Refs: petgraph#849

…etgraph#849)

The function 'zip' was introduced in petgraph#747 as a part of adding `no_std`
support. However, there is already such a function in `core::iter`. The
MSRV stated in the description of petgraph#747 was 1.64 at minimum, but the
function in `core` is stable since Rust 1.59. Thus, it is an unnecessary
duplication and can be removed without consequences.

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Co-authored-by: cactusdualcore <[email protected]>

This was discussed in an earlier PR and removes `util.rs` and the `enumerate` function in that file.

Refs: petgraph#849

…etgraph#849)

The function 'zip' was introduced in petgraph#747 as a part of adding `no_std`
support. However, there is already such a function in `core::iter`. The
MSRV stated in the description of petgraph#747 was 1.64 at minimum, but the
function in `core` is stable since Rust 1.59. Thus, it is an unnecessary
duplication and can be removed without consequences.

<!--
  -- Thanks for contributing to `petgraph`! 
  --
-- We require PR titles to follow the Conventional Commits
specification,
-- https://www.conventionalcommits.org/en/v1.0.0/. This helps us
generate
  -- changelogs and follow semantic versioning.
  --
  -- Start the PR title with one of the following:
  --  * `feat:` for new features
  --  * `fix:` for bug fixes
  --  * `refactor:` for code refactors
  --  * `docs:` for documentation changes
  --  * `test:` for test changes
  --  * `perf:` for performance improvements
  --  * `revert:` for reverting changes
  --  * `ci:` for CI/CD changes
-- * `chore:` for changes that don't fit in any of the above categories
  -- The last two categories will not be included in the changelog.
  --
-- If your PR includes a breaking change, please add a `!` after the
type
-- and include a `BREAKING CHANGE:` line in the body of the PR
describing
  -- the necessary changes for users to update their code.
  --
  -->

Co-authored-by: cactusdualcore <[email protected]>

This was discussed in an earlier PR and removes `util.rs` and the `enumerate` function in that file.

Refs: petgraph#849

## 🤖 New release

* `petgraph`: 0.8.2 -> 0.8.3 (✓ API compatible changes)

<details><summary><i><b>Changelog</b></i></summary><p>

<blockquote>

##
[0.8.3](https://github.com/petgraph/petgraph/compare/[email protected]@v0.8.3)
- 2025-09-28

### Bug Fixes

- Infinite `subgraph_isomorphisms_iter` for empty isomorphisms
([#780](#780))
- Algos don't work on `UndirectedAdaptor`
([#870](#870))
([#871](#871))
- use a queue for SPFA
([#893](#893))
- `StableGraph::reverse` breaks free lists
([#890](#890))

### Documentation

- Fix examples link in README and unify typesetting of one word
([#823](#823))
- Add link to multigraph definition to isomorphism algos
([#824](#824))
- Fix auxiliary space (and time) complexity of bron-kerbosch
([#825](#825))
- Fix Typo in Operator Module Documentation
([#831](#831))
- Sync the crate feature flags in the README and docs
([#832](#832))
- Remove all \[Generic\] tags from algo docstrings
([#835](#835))
- Fix typos in comments
([#836](#836))
- Revamp CONTRIBUTING.md
([#833](#833))
- Update `GraphMap` link in README
([#857](#857))
- Add doc comment for `Dot::with_attr_getters`
([#850](#850))
- Specify iteration order for neighbors and edges and their variants
([#790](#790))
- Collection of Doc fixes
([#856](#856))

### New Features

- Add `into_nodes_edges_iters` to `StableGraph`
([#841](#841))
- Add methods to reserve & shrink `StableGraph` capacity
([#846](#846))
- Add Dinic's Maximum Flow Algorithm
([#739](#739))
- make Csr::from_sorted_edges generic over edge type and properly
increase edge_count in Csr::from_sorted_edges
([#861](#861))
- Add `map_owned` and `filter_map_owned` for `Graph` and `StableGraph`
([#863](#863))
- Add dijkstra::with_dynamic_goal
([#855](#855))
- Fix self-loop bug in all_simple_paths and enable multiple targets
([#865](#865))
- mark petgraph::dot::Dot::graph_fmt as public
([#866](#866))
- Add bidirectional Dijkstra algorithm
([#782](#782))

### Performance

- Make A* tie break on lower h-values
([#882](#882))

### Refactor

- add examples for scc algorithms and reorganize into dedicated module
([#830](#830))
- Remove unnecessary trait bounds from impls/methods
([#828](#828))
- replace uses of 'crate::util::zip' with 'core::iter::zip'
([#849](#849))
- Fix clippy (and other) lints
([#851](#851))
- Cleanup repo ([#854](#854))
- replace crate::util::enumerate with Iterator::enumerate
([#881](#881))

### Testing

- Add dependency list for 'quickcheck' feature
([#822](#822))
- Fix feature cfg capitalization in doctest
([#852](#852))
</blockquote>


</p></details>

---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Egor Starovoitov <[email protected]>