[CI] Upgrade cache action to v6

.github/workflows/Check_commit_message.yml

@@ -37,7 +37,7 @@ jobs:
               echo "::error::Commit $SHORT is missing a [Tag] prefix. Expected format: [Tag] Description (e.g. [CPU] Fix overflow in JIT)"
               FAILED=1
             fi
-          done <<< "${COMMITS}"
+          done <<< "$COMMITS"
 
           echo
 

.github/workflows/Linux_x86.yml

@@ -29,14 +29,14 @@ jobs:
 
       - name: Cache Vulkan SDK
         id: cache-vulkan-sdk-linux
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/vulkan-sdk
           key: ${{ runner.os }}-vulkan-sdk-latest
 
       - name: Cache linuxdeploy tools
         id: cache-linuxdeploy
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: ~/linuxdeploy
           key: ${{ runner.os }}-linuxdeploy-tools

.github/workflows/Windows_x86.yml

@@ -19,7 +19,7 @@ jobs:
 
       - name: Cache Vulkan SDK
         id: cache-vulkan-sdk
-        uses: actions/cache@v5
+        uses: actions/cache@v6
         with:
           path: C:\VulkanSDK
           key: ${{ runner.os }}-vulkan-sdk-${{ hashFiles('**/vulkan-sdk.exe') }}
@@ -40,12 +40,12 @@ jobs:
 
           # Verify shader tools are available
           foreach ($tool in @("glslangValidator", "spirv-opt", "spirv-dis")) {
-            $toolPath = "${env:VULKAN_SDK}\Bin\$tool.exe"
+            $toolPath = "${env:VULKAN_SDK}\Bin\${tool}.exe"
             if (Test-Path "$toolPath") {
               echo "$tool found at: $toolPath"
               & $toolPath --version 2>$null
             } else {
-              echo "Warning: $tool.exe not found at expected location"
+              echo "Warning: ${tool}.exe not found at expected location"
             }
           }