also pin official github actions

.github/workflows/mac-dmg.yml

@@ -45,9 +45,9 @@ jobs:
           openjfx-url: 'https://download2.gluonhq.com/openjfx/25/openjfx-25_osx-aarch64_bin-jmods.zip'
           openjfx-sha: '13f8c0513c40c95881479fbcf0465a29a60217393fb0656f5e4eab78a9442fba'
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8
       - name: Setup Java
-        uses: actions/setup-java@v5
+        uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165
         with:
           distribution: ${{ env.JAVA_DIST }}
           java-version: ${{ env.JAVA_VERSION }}
@@ -281,7 +281,7 @@ jobs:
         run: security delete-keychain $RUNNER_TEMP/codesign.keychain-db
         continue-on-error: true
       - name: Upload artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02
         with:
           name: dmg-${{ matrix.output-suffix }}
           path: |