Bump ansible-core from 2.20.4 to 2.21.0 in /gitlab (#57)

Bumps [ansible-core](https://github.com/ansible/ansible) from 2.20.4 to 2.21.0.
- [Release notes](https://github.com/ansible/ansible/releases)
- [Commits](ansible/ansible@v2.20.4...v2.21.0)

---
updated-dependencies:
- dependency-name: ansible-core
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gitlab/requirements.in

@@ -1,6 +1,6 @@
 # Source for locked requirements.txt — regenerate:
 #   pip-compile requirements.in -o requirements.txt --strip-extras
-ansible-core==2.20.4
+ansible-core==2.21.0
 cryptography>=46.0.7  # CVE-2026-39892, CVE-2026-34073 (transitive via ansible-core/paramiko)
 paramiko>=5.0.0
 pynetbox>=7.0.0

gitlab/requirements.txt

@@ -4,7 +4,7 @@
 #
 #    pip-compile --output-file=requirements.txt --strip-extras requirements.in
 #
-ansible-core==2.20.4
+ansible-core==2.21.0
     # via -r requirements.in
 bcrypt==5.0.0
     # via paramiko