ci(ansible-lint): fix ansible-lint not working because of invalid python version

The latest version of ansible-nas uses Python 3.14, which requires at least ansible-core version 2.20, which isn't out yet.
To avoid constantly failing tests, we manually install Python 3.12

This commit should be reverted once:
- ansible-core 2.20 comes out
- This PR gets merged, allowing us to specify the python version: ansible/ansible-lint#4829

ansible/ansible-lint#4830

Author: Dylancyclone

.github/workflows/ansible-lint.yml

@@ -9,6 +9,12 @@ jobs:
     name: Ansible Lint # Naming the build is important to use it as a status check
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: '3.12'
       - name: Run ansible-lint
-        uses: ansible/ansible-lint@main
+        uses: ansible/ansible-lint@main
+        with:
+          setup_python: "false"