Mailsetup Migration from mailcow to mailu

See merge request !55

Update wordpress Docker tag to v6.2.0

See merge request !45

Update 42wim/matterbridge Docker tag to v1.26

See merge request !31

Update coturn/coturn Docker tag to v4.6.1

See merge request !32

Update gitlab/gitlab-ce Docker tag to v15.10.2

See merge request !35

Update gitea/gitea Docker tag to v1.19.0

See merge request !34

Update redis Docker tag to v7.0.10

See merge request !54

fix missing Date Header in sendmail_plenum.py (closes #39)

Closes #39

See merge request !21