[ISRR-516] Use commit hashes instead of tags for actions

.github/workflows/ci.yml

@@ -14,22 +14,22 @@ jobs:
     name: Build and Test
     strategy:
       matrix:
-        scala: [2.12.13, 2.13.5]
+        scala: [2.13.13]
 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout current branch
-        uses: actions/checkout@v2
+        uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
         with:
           fetch-depth: 0
 
       - name: Setup Java and Scala
-        uses: olafurpg/setup-scala@v10
+        uses: olafurpg/setup-scala@32ffa16635ff8f19cc21ea253a987f0fdf29844c
         with:
           java-version: [email protected]
 
       - name: Cache sbt
-        uses: actions/cache@v2
+        uses: actions/cache@0c45773b623bea8c8e75f6c82b208c3cf94ea4f9
         with:
           path: |
             ~/.sbt