Test: README-only change should skip all workflows

Signed-off-by: Hanxi Zhang <hanxizh@amazon.com>

Author: hanxizh9910

README.md

@@ -369,4 +369,4 @@ Wilmington, Delaware 19802-4447
 
 [1]: https://github.com/valkey-io/valkey/blob/unstable/COPYING
 [2]: https://github.com/valkey-io/valkey/blob/unstable/CONTRIBUTING.md
-[3]: https://github.com/valkey-io/valkey/blob/unstable/SECURITY.md
+[3]: https://github.com/valkey-io/valkey/blob/unstable/SECURITY.md