Bump the pip group across 1 directory with 1 update

Bumps the pip group with 1 update in the / directory: [ansible-core](https://github.com/ansible/ansible).


Updates `ansible-core` from 2.14.12 to 2.15.9
- [Release notes](https://github.com/ansible/ansible/releases)
- [Commits](ansible/ansible@v2.14.12...v2.15.9)

---
updated-dependencies:
- dependency-name: ansible-core
  dependency-type: direct:production
  dependency-group: pip-security-group
...

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

requirements.txt

@@ -7,4 +7,4 @@ antsibull-docs
 sphinx
 sphinx-ansible-theme
 galaxy-importer==0.5.0
-ansible-core==2.14.12
+ansible-core==2.15.9