Enable token refresh for Gitlab

[ryan-s]

Gitlab removed support for optionally expiring tokens in Gitlab 15.0. Adding in the refresh as optional since there may be self hosted instances in the wild older then 15.0.

https://docs.gitlab.com/ee/integration/oauth_provider.html#access-token-expiration

[codecov[bot]]

Codecov Report

Merging #422 (a8d5bac) into main (27add75) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
+ Coverage   96.35%   96.36%   +0.01%     
==========================================
  Files          37       37              
  Lines        1070     1073       +3     
==========================================
+ Hits         1031     1034       +3     
  Misses         39       39              

Files Changed	Coverage Δ
flask_dance/contrib/gitlab.py	96.00% <100.00%> (+0.54%)	:arrow_up:

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[ryan-s]

Pinned pillow to 9.5 based on https://bugs.launchpad.net/tacker/+bug/2026345

[daenney]

Pinned pillow to 9.5 based on https://bugs.launchpad.net/tacker/+bug/2026345

Ah, nice catch. Thank you!