changes: Add changes file for ticket #40019

Signed-off-by: David Goulet <dgoulet@torproject.org>

changes/ticket40019

+  o Code simplification and refactoring (maintainer scripts):
+    - Disable by default the pre-commit hook. Use the environment variable
+      TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it. Furthermore, stop running
+      practracker in the pre-commit hook and make check-local. Closes ticket
+      40019.