Fix assertion in CI workflow for string.lower test

Author: cclauss

.github/workflows/ci.yml

@@ -27,4 +27,5 @@ jobs:
           print(f"{lg.string = }")
           print(f"{lg.string.lower = }")
           print(f"{lg.string.lower('Hello world!') = }")
-          assert lg.string.lower('Hello world!') == 'Hello world!'
+          assert lg.string.lower('Hello world!') != 'Hello world!'
+          assert lg.string.lower('Hello world!') == 'hello world!'