Fix CI: Update all actions to v4 (checkout, cache, upload-artifact)

Author: Developer

.github/workflows/openvx-conformance.yml

@@ -28,7 +28,7 @@ jobs:
 
     steps:
     - name: Checkout rustVX
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         fetch-depth: 0
 
@@ -52,23 +52,23 @@ jobs:
         cargo --version
     
     - name: Cache Cargo registry
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/registry
         key: ${{ runner.os }}-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
         restore-keys: |
           ${{ runner.os }}-cargo-registry-
     
     - name: Cache Cargo index
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: ~/.cargo/git
         key: ${{ runner.os }}-cargo-index-${{ hashFiles('**/Cargo.lock') }}
         restore-keys: |
           ${{ runner.os }}-cargo-index-
     
     - name: Cache Cargo build
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: target
         key: ${{ runner.os }}-cargo-build-target-${{ hashFiles('**/Cargo.lock') }}
@@ -77,7 +77,7 @@ jobs:
     
     - name: Cache OpenVX CTS build
       id: cache-cts
-      uses: actions/cache@v3
+      uses: actions/cache@v4
       with:
         path: OpenVX-cts/build
         key: ${{ runner.os }}-cts-${{ hashFiles('OpenVX-cts/CMakeLists.txt') }}
@@ -193,7 +193,7 @@ jobs:
         echo "fail_count=$FAIL_COUNT" >> $GITHUB_OUTPUT
     
     - name: Upload test results
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       if: always()
       with:
         name: conformance-test-results