[dependabot]: Bump pulp-ostree from 2.3.0 to 2.4.0 in /automation

Bumps [pulp-ostree](https://github.com/pulp/pulp_ostree) from 2.3.0 to 2.4.0.
- [Release notes](https://github.com/pulp/pulp_ostree/releases)
- [Changelog](https://github.com/pulp/pulp_ostree/blob/2.4.0/CHANGES.md)
- [Commits](pulp/pulp_ostree@2.3.0...2.4.0)

---
updated-dependencies:
- dependency-name: pulp-ostree
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

automation/requirements.txt

@@ -6,7 +6,7 @@ pulp-ansible==0.21.6
 pulp-python==3.11.1
 pulpcore-client==3.49.10
 pulp-rpm-client==3.25.4
-pulp-ostree==2.3.0
+pulp-ostree==2.4.0
 pulp-glue==0.25.6
 pulp-cli==0.25.6
 pulp-cli-deb==0.1.0