ci: fix the go vet -tags invocation

This was originally quoted to see if the CI was permuting the flags
correctly, but was never changed from a string into a process call.
This amends that.

.github/actions/test/action.yaml

@@ -31,7 +31,7 @@ runs:
             return $combinations
         }
         $tagValues | ForEach-Object {
-            "go vet -tags=$_ ${commandPath}"
+            go vet -tags="$_" "${commandPath}"
         }
         go test -cover ${commandPath}
         go test -race ${commandPath}