pin test gitea instance to v1.19.3

[souleb]

Description

We pin the version here to avoid regression on test infra.

refs #230

[codecov-commenter]

Codecov Report

Patch coverage: 63.93% and project coverage change: +2.75 🎉

Comparison is base (f046b17) 58.78% compared to head (5330b23) 61.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   58.78%   61.53%   +2.75%     
==========================================
  Files          75       73       -2     
  Lines        6182     6105      -77     
==========================================
+ Hits         3634     3757     +123     
+ Misses       2004     1782     -222     
- Partials      544      566      +22     

Impacted Files	Coverage Δ
gitea/client_repository_tree.go	0.00% <0.00%> (ø)
gitea/resource_commit.go	27.77% <27.77%> (ø)
gitea/resource_teamaccess.go	32.20% <32.20%> (ø)
gitea/client_repository_teamaccess.go	37.66% <37.66%> (ø)
gitea/client_repository_file.go	48.14% <48.14%> (ø)
gitea/client_repository_deploykey.go	52.47% <52.47%> (ø)
gitea/client_repository_pullrequest.go	56.60% <56.60%> (ø)
gitea/client_organizations.go	60.71% <60.71%> (ø)
gitea/util.go	61.90% <61.90%> (ø)
gitea/client_organization_teams.go	64.10% <64.10%> (ø)
... and 9 more

... and 21 files with indirect coverage changes

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[makkes]

Thanks for the quick fix!