Pin third-party actions to currently used SHA (#10)

Author: nickcollisson-workos

.github/workflows/coana-guardrail.yml

@@ -9,7 +9,7 @@ jobs:
     steps:
       - name: Get changed files
         id: changed-files
-        uses: tj-actions/changed-files@v44
+        uses: tj-actions/changed-files@2d756ea4c53f7f6b397767d8723b3a10a9f35bf2 # v44
         with:
           separator: ' '