Pin dependencies (#10)

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

Author: elastic-renovate-prod[bot]

.github/workflows/ci.yml

@@ -19,16 +19,16 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
-      - uses: actions/setup-java@v5
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5
         with:
           distribution: 'temurin'
           java-version: '17'
       - name: Checks and unit tests
         run: ./checks.sh
       - name: Store test results
         if: success() || failure()
-        uses: actions/upload-artifact@v5
+        uses: actions/upload-artifact@330a01c490aca151604b8cf639adc76d48f6c5d4 # v5
         with:
           name: test-results
           path: |
@@ -46,7 +46,7 @@ jobs:
       - checks
     steps:
       - id: check
-        uses: elastic/oblt-actions/check-dependent-jobs@v1
+        uses: elastic/oblt-actions/check-dependent-jobs@87e7632492c0facca73eeba1b9e5b3f5b1e51baf # v1
         with:
           jobs: ${{ toJSON(needs) }}
       - run: ${{ steps.check.outputs.is-success }}