[dependabot]: Bump pulpcore from 3.49.19 to 3.49.20 in /automation

Bumps [pulpcore](https://github.com/pulp/pulpcore) from 3.49.19 to 3.49.20.
- [Release notes](https://github.com/pulp/pulpcore/releases)
- [Changelog](https://github.com/pulp/pulpcore/blob/3.49.20/CHANGES.md)
- [Commits](pulp/pulpcore@3.49.19...3.49.20)

---
updated-dependencies:
- dependency-name: pulpcore
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

automation/requirements.txt

@@ -1,4 +1,4 @@
-pulpcore==3.49.19
+pulpcore==3.49.20
 pulp-container==2.20.3
 pulp-deb==3.2.1
 pulp-rpm==3.26.1