Pin elastic/oblt-actions action to aa173b7 (#1858)

Co-authored-by: elastic-renovate-prod[bot] <174716857+elastic-renovate-prod[bot]@users.noreply.github.com>
Co-authored-by: Karen Metts <[email protected]>

Author: elastic-renovate-prod[bot]

.github/workflows/github-commands-comment.yml

@@ -15,4 +15,4 @@ jobs:
     permissions:
       pull-requests: write
     steps:
-      - uses: elastic/oblt-actions/elastic/github-commands@v1
+      - uses: elastic/oblt-actions/elastic/github-commands@aa173b79cf5ba8a4255502321885bece408e2359 # v1