Fix regex pattern for extracting version in version_check.yml (#6446)

Author: sunliang98

.github/workflows/version_check.yml

@@ -25,7 +25,7 @@ jobs:
       # Validate version.h matches the release tag
       - name: Assert version increment
         run: |
-          CODE_VERSION=$(grep -oP '#define\s+VERSION\s+"\K\d+(\.\d+){2,3}' source/source_main/version.h)
+          CODE_VERSION=$(grep -oP '#define\s+VERSION\s+"\Kv?\d+(\.\d+){2,3}' source/source_main/version.h)
 
           if [[ -z "$CODE_VERSION" ]]; then
             echo "::error::Failed to extract version from source/source_main/version.h"