Revert "Add GitHub action for labelling PRs"

This reverts commit 0ff13dcf.

CHANGELOG.md

@@ -1,14 +1,6 @@
 CHANGELOG
 =========
 
-0.69.0
-------
-- Added `change-with-nth` action for dynamically changing the `--with-nth` option
-  ```sh
-  echo -e "a b c\nd e f\ng h i" | fzf --with-nth .. \
-    --bind 'space:change-with-nth(1|2|3|1,3|2,3|)'
-  ```
-
 0.68.0
 ------
 - Implemented word wrapping in the list section