Bump rpds-py from 0.20.0 to 0.21.0

Bumps [rpds-py](https://github.com/crate-py/rpds) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/crate-py/rpds/releases)
- [Commits](crate-py/rpds@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: rpds-py
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -349,7 +349,7 @@ requests==2.32.3
     # via
     #   sphinx
     #   sphinx-jsonschema
-rpds-py==0.20.0
+rpds-py==0.21.0
     # via
     #   jsonschema
     #   referencing