…#52)

## Summary

Resolves all **24 open Dependabot security alerts** (2 critical, 6 high,
14 medium, 2 low) across three ecosystems by updating vulnerable
dependencies in test infrastructure.

**Note:** All affected dependencies are in test infrastructure
(`integration-tests/`, `local_tests/`), not the production Rust
extension (`bottlecap/`).

## Changes

### npm (`integration-tests/`)
- **axios** `^1.6.7` → `^1.15.0` — fixes SSRF bypass via NO_PROXY
hostname normalization (CVE-2025-62718, critical)

### Go (`local_tests/golang/`)
- **golang.org/x/net** `v0.2.0` → `v0.52.0` — fixes 8 alerts: HTTP/2
rapid reset, uncontrolled resource consumption, XSS, IPv6 zone ID proxy
bypass, excessive memory growth, stream cancellation, improper text
rendering
- **google.golang.org/grpc** `v1.50.1` → `v1.80.0` — fixes 2 alerts:
authorization bypass via missing leading slash (CVE-2026-33186,
critical), HTTP/2 rapid reset
- **google.golang.org/protobuf** `v1.28.1` → `v1.36.11` — fixes infinite
loop in protojson.Unmarshal
- **github.com/golang/glog** `v1.0.0` → `v1.2.5` — fixes insecure
temporary file usage

### Python (`local_tests/serverless-init/`)
- **Flask** `2.1.2` → `3.1.3` — fixes session cookie disclosure, missing
Vary:Cookie header
- **Werkzeug** `2.2.2` → `3.1.8` — fixes 9 alerts: debugger RCE,
safe_join Windows device name bypasses, multipart form DoS, resource
exhaustion, nameless cookie bypass

## Reviewer Notes

⚠️ **Go minimum version**: The `go` directive in
`local_tests/golang/go.mod` was auto-upgraded from `go 1.22` to `go
1.25.0` (required by `golang.org/x/net v0.52.0`). This only affects the
test Lambda function, not CI build toolchains for the main extension.

⚠️ **Flask/Werkzeug major version jump**: Flask 2.x → 3.x and Werkzeug
2.x → 3.x are major version bumps. The test app (`app.py`) uses minimal
Flask APIs and was reviewed for compatibility. However, `ddtrace==1.4.1`
compatibility with Flask 3.x should be verified in CI.

## Alert Breakdown

| Severity | Count | Alerts |
|----------|-------|--------|
| Critical | 2 | #128 (axios SSRF), #104 (gRPC auth bypass) |
| High | 6 | #52, #43, #40, #38, #37, #20 |
| Medium | 14 | #88, #74, #73, #70, #68, #65, #60, #59, #53, #51, #49,
#45, #41, #36 |
| Low | 2 | #89, #39 |

Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]>