docs: added release notes for 4.12.1

repo-feed: fix path-based permissions condition on caching element. - the check condition was accidentally flipped the wrong way.

hooks: execute web-based hooks for SVN

diffs: skip lines in diff to allow user selection from diff view.

re-captcha: adjust for v2 that is the only left one supported since 1st of May.

ldap: use connection ping only in case of single server specifed.

mercurial: compatability changes for mercurial 4.6.0 release

db: adjust beaker_cache column size. If this column is created via Beaker itself it uses BLOB for mysql, this can cause some issues with cache sizes not fitting. We move the creation into our script, then it uses proper size.

diffs: skip lines in diff to allow user selection from diff view.

audit: properly store IP address for user registration