CI: Fix failure when trying to move Qt x86 zip

Due to recent changes to remove unnecessary x86 builds, the Qt x86
artifact no longer exists, so CI fails during release creation. Instead
of assuming the file exists for all architectures, use a test and an if
statement to check for possible matches.

.github/workflows/main.yaml

@@ -623,7 +623,9 @@ jobs:
             zip -r windows-deps-${{ steps.metadata.outputs.version }}-${arch}.zip -- *
             mv windows-deps-${{ steps.metadata.outputs.version }}-${arch}.zip ${GITHUB_WORKSPACE}
 
-            mv ${GITHUB_WORKSPACE}/qt6-windows-${arch}-!(*-@(Debug|RelWithDebInfo|Release|MinSizeRel))/*.zip ${GITHUB_WORKSPACE}
+            if [[ -f ${GITHUB_WORKSPACE}/qt6-windows-${arch}-!(*-@(Debug|RelWithDebInfo|Release|MinSizeRel))/*.zip ]]; then
+              mv ${GITHUB_WORKSPACE}/qt6-windows-${arch}-!(*-@(Debug|RelWithDebInfo|Release|MinSizeRel))/*.zip ${GITHUB_WORKSPACE}
+            fi
             popd > /dev/null
           done