Fix test block bypass instructions

A new string was added in 521c0cb and the old one removed with 2ed31f9

[NO NEW TESTS NEEDED]

Signed-off-by: Jakob Ahrer <jakob@ahrer.dev>

CONTRIBUTING.md

@@ -150,7 +150,7 @@ Regardless of the type of PR, all PRs should include:
 * additional testcases. Ideally, they should fail w/o your code change applied.
   (With a few exceptions, CI hooks will block your PR unless your change
   includes files named `*_test.go` or under the `test/` subdirectory. To
-  bypass this block, include the string `[NO TESTS NEEDED]` in your
+  bypass this block, include the string `[NO NEW TESTS NEEDED]` in your
   commit message).
 * documentation changes.