Update elastic/oblt-actions digest to f15e522 (#1962)

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@dbb6b183abcf22f595ad943862358d25a929c129 # v1
+      - uses: elastic/oblt-actions/elastic/github-commands@f15e5228b7eb0eff4e1734e0af22a3fd40928bf6 # v1