Bug#1073117: Made minor, but insufficient updates to pagure

[Diane Trout <diane@ghic.org>]

Hi,

I thought pagure looked need, so I attempted to get it to run on Debian
stable. I ran into #1055204 and another change in jinja2's api.

I backported upstreams fixes, and tried them but then I got stuck on a
problem looking for the session object.

  File "/usr/lib/python3/dist-packages/flask/app.py", line 2373, in
do_teardown_request
    self.ensure_sync(func)(exc)
  File "/usr/lib/python3/dist-packages/pagure/flask_app.py", line 536,
in end_request
    flask.g.session.remove()
  File "/usr/lib/python3/dist-packages/flask/ctx.py", line 52, in
__getattr__
    raise AttributeError(name) from None
AttributeError: session

I don't know if that's a bug or I misconfigured something

Upstream also didn't put their most recent 5.14 release into their
releases directory so I updated the watch file to point to the
application generated releases page.

Since all of these were pretty minor updates, I went ahead and pushed
them to salsa.

Good luck to the next person.

Diane