Updated package for pgfincore

Hi All,

I was reviewing the list of team packages with RC bugs [0] and I saw
that pgfincore has a FTBFS bug [1] that has resulted in the package
being removed from forky/testing. It looks like the package needs to be
updated for postgresql-18 and there are some minor code changes to get
the package compiling with this major version. I have updated the
extension and its packaging and tested them locally, however I do not
have push permission for the code repository [2,3]. What's the best way
for me to submit the changes?

-- Bradford

[0]: https://tracker.debian.org/teams/postgresql/
[1]: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1117300
[2]: https://git.postgresql.org/git/pgfincore.git
[3]: https://git.postgresql.org/gitweb/?p=pgfincore.git;a=summary