pin actions to sha256

Signed-off-by: Appu Goundan <[email protected]>

Author: loosebazooka

.github/workflows/ci.yaml

@@ -38,7 +38,7 @@ jobs:
     steps:
     - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
     - name: Set up JDK ${{ matrix.java-version }}
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018 # v4.2.2
       with:
         java-version: ${{ matrix.java-version }}
         distribution: 'temurin'

.github/workflows/conformance.yml

@@ -27,7 +27,7 @@ jobs:
           distribution: 'temurin'
 
       - name: Setup Gradle
-        uses: gradle/actions/setup-gradle@v4
+        uses: gradle/actions/setup-gradle@af1da67850ed9a4cedd57bfd976089dd991e2582 # v4.0.0
 
       - name: Build sigstore-java cli
         run: ./gradlew :sigstore-cli:build

.github/workflows/examples.yaml

@@ -21,10 +21,10 @@ jobs:
       id-token: write
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
 
     - name: Setup Java
-      uses: actions/setup-java@v4
+      uses: actions/setup-java@6a0805fcefea3d4657a47ac4c165951e33482018 # v4.2.2
       with:
         java-version: 11
         distribution: 'temurin'