Use consistent actions/checkout version like in other workflow files (#555)

Author: wenju-he

.github/actions/build-opencl-clang/action.yml

@@ -29,21 +29,21 @@ runs:
       shell: bash
 
     - name: Checkout LLVM
-      uses: actions/checkout@v3
+      uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       with:
         repository: llvm/llvm-project
         path: llvm-project
         ref: ${{ inputs.ref_llvm }}
 
     - name: Checkout SPIRV-LLVM-Translator
-      uses: actions/checkout@v3
+      uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       with:
         repository: KhronosGroup/SPIRV-LLVM-Translator
         path: llvm-project/SPIRV-LLVM-Translator
         ref: ${{ inputs.ref_translator }}
 
     - name: Checkout opencl-clang
-      uses: actions/checkout@v3
+      uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
       with:
         path: llvm-project/opencl-clang
         ref: ${{ inputs.ref_opencl-clang }}

.github/workflows/patch-release.yml

@@ -17,7 +17,7 @@ jobs:
       branches_json: ${{steps.release_branches.outputs.branches_json}}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
         with:
             fetch-depth: 0
       - name: Get latest llvm_release branch
@@ -49,7 +49,7 @@ jobs:
       matrix: ${{fromJson(needs.setup.outputs.branches_json)}}
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@a5ac7e51b41094c92402da3b24376905380afc29 # v4.1.6
         with:
             ref: ${{ matrix.branch }}
             fetch-depth: 0