Add support for postgresql-14 for Fedora

[phracek]

It would be nice to have support for postgresql-14 in our posgresql-image as well.
In order to support it, we need to modify these files:

• https://github.com/sclorg/postgresql-container/blob/master/specs/multispec.yml
• https://github.com/sclorg/postgresql-container/blob/master/src/Dockerfile.fedora
• https://github.com/sclorg/postgresql-container/blob/master/manifest.sh

See the similar pull request for support postgresql-container for CentOS Stream 8 here: #437

[phracek]

This pull request has to be merged before sclorg/s2i-base-container#254

[Victoremepunto]

bump - since sclorg/s2i-base-container#254 has already been merged, would like to know if getting postgresql-14 support is blocked on anything else ? thanks !

[phracek]

Closing in favour of #493