Pin alphagov/govuk-infrastructure action to 2de89c3

Author: govuk-ci

.github/workflows/actionlint.yml

@@ -13,4 +13,4 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd   # v6.0.2
         with:
           show-progress: false
-      - uses: alphagov/govuk-infrastructure/.github/actions/actionlint@main
+      - uses: alphagov/govuk-infrastructure/.github/actions/actionlint@2de89c3ebe23b926c11d6c304362bfc8e32c7398 # main