Release 8.0.0 (#2318)

* Release 8.0.0

Finalize CHANGES.md for the 8.0.0 release and bump the version in setup.cfg.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

* Bump src/bandersnatch/__init__.py version + document dual version location

__init__.py's __version_info__ is a second source of truth for the
package version alongside setup.cfg and was missed on the first pass
of this release. Update CLAUDE.md's release steps and conventions so
both files are bumped together going forward.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>

Move version to 7.1.0 for release + update CHANGES

Move version to 7.0.1 for release + update CHANGES

Move version to 7.0.0 for release + update CHANGES

Move version to 6.8.0 for release + update CHANGES

Move version to 6.7.0 for release + update CHANGES

Fix CHANGES formatting miss

Move version to 6.5.0 for release

Move version to 6.4.0 for release

Update version to 6.3.0 for release (#1443)

- Fix + delete some uneeded comments
- Add more verbosity to release notes encouraging users to update all the Simple API files