v3.0.0a1

What's Changed

• use literal instead of Enum for FilterLang by @vincentsarago in #686
• switch to fastapi-slim by @vincentsarago in #687
• Remove pystac by @jonhealy1 in #690
• update conformance and spec urls by @vincentsarago in #691
• Feature/update stac pydantic3.1.0 by @vincentsarago in #697
• Make str_to_interval not return a tuple for single-value input by @avbentem in #692
• BUGFIX: invalid landing page link when filter-extension is enabled by @vincentsarago in #695
• Release/v3.0.0a1 by @vincentsarago in #699

Full Changelog: 3.0.0a0...3.0.0a1