Bump markus[datadog] from 5.0.0 to 5.1.0

Bumps [markus[datadog]](https://github.com/willkg/markus) from 5.0.0 to 5.1.0.
- [Changelog](https://github.com/willkg/markus/blob/main/HISTORY.rst)
- [Commits](willkg/markus@v5.0.0...v5.1.0)

---
updated-dependencies:
- dependency-name: markus[datadog]
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -23,7 +23,7 @@ google-cloud-profiler==4.1.0
 google-cloud-sqlcommenter==2.0.0; python_version < '3.12'
 gunicorn==23.0.0
 jwcrypto==1.5.6
-markus[datadog]==5.0.0
+markus[datadog]==5.1.0
 pem==23.1.0
 psycopg[c]==3.2.3
 PyJWT==2.9.0