chore: update pull request template release notes

Signed-off-by: Terry Howe <[email protected]>

.github/PULL_REQUEST_TEMPLATE.md

@@ -36,5 +36,5 @@ If yes, a release note is required:
 Enter your extended release note in the block below. If the PR requires additional action from users switching to the new release, include the string "action required".
 -->
 ```release-note
-none
+NONE
 ```