chore(deps): switch actions/checkout to full semantic version

Author: dafyddj

.github/workflows/commitlint.yml

@@ -10,5 +10,5 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       # yamllint disable rule:line-length
-      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
+      - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - uses: wagoid/commitlint-github-action@9763196e10f27aef304c9b8b660d31d97fce0f99 # v5