Dockerfile label updates, change version string in RELEASE.txt LABELS now use ci standard opencontainers naming for: vendor, description and version annotations. In version, source value was removed and source moved to description. Added annotations for: title licenses documentation licenses includes Python-2.0 license in preparation for vendoring cgi and cgitb modules in 2.4.0. Updated RELEASE.txt to include version string in Dockerfile.

# human timezones
pytz
# indexer
Whoosh
# xapian is also installed
# extra database support
psycopg2
mysqlclient
redis
# encryption
gpg
# java web tokens
PyJWT
# extra HTTP compression methods
Brotli
zstd
# jinja2 template engine
Jinja2