v10.3.3 🌈 Use Astral mirror for version manifests with GitHub fallback

Changes

This release contains something that should have been included a very long time ago. Sorry for sleeping on that.

This action now retrieves the release manifest that contains the available versions, their download links and checksums from the Astral mirror, rather than trying GitHub first. This should present much more stable.
(Known checksums are still checked, so the security impact does not change)

Also a big thank you to @soujasK for a set of bugfixes 👏

🐛 Bug fixes

• Use Astral mirror for version manifests with GitHub fallback @eifinger (#1119)
• fix: allow whitespace in uv requirement specifiers @soujasK (#1112)
• fix: resolve ~= specifiers with PEP 440 semantics @soujasK (#1111)
• fix: only report a saved cache when saving succeeded @soujasK (#1110)

🧰 Maintenance

• chore: update known checksums for 0.13.6 @github-actions[bot] (#1117)

📚 Documentation

• docs: use JSDoc for compatible release specifier comment @eifinger (#1113)
• docs: update version references to v10.3.2 @github-actions[bot] (#1104)