deps: bumped rhodecode-tools==4.0.0

deps: bumped celery==5.4.0

deps: updated test deps

fix(tests): fixed tests for PR celery hooks deamon

bug: fixed docs not building by adding release notes to index

fix: added release notes. Fixes: RCCE-140

fix: fixed problems on UI in case of long commit messages. Fixes: RCCE-140

fix(emails): fixed white background in email templates

fix(css): distinguish code/pre from #message

fix(styling): fixed white background for markdown block codes