Pin GitHub Actions to full commit SHAs

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: carlosroman

.github/workflows/ci.yml

@@ -17,8 +17,8 @@ jobs:
           - os: windows-latest
             java-version: '12'
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           java-version: ${{ matrix.java-version }}
           distribution: zulu
@@ -33,8 +33,8 @@ jobs:
     name: Test (Java 8, jnr-exclude)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           java-version: '8'
           distribution: zulu
@@ -49,8 +49,8 @@ jobs:
     name: Test (Java 8, jnr-latest)
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-java@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
         with:
           java-version: '8'
           distribution: zulu