Changes proposed in this Pull Request

Change config files using the weather years for dunkelflaute, central and high VRES years

Checklist

• I tested my contribution locally and it works as intended.
• Code and workflow changes are sufficiently documented.
• Changed dependencies are added to pixi.toml (using pixi add <dependency-name>).
• Changes in configuration options are added in config/config.default.yaml.
• Changes in configuration options are documented in doc/configtables/*.csv.
• OET SPDX license header added to all touched files.
• Sources of newly added data are documented in doc/data_sources.rst.
• A release note doc/release_notes.rst is added.
• I will remember to squash merge the PR.