Changelog for 1.12.4 release (#12687)

[6543]

Frontport of #12687

[jolheiser]

Update version in docs. 🙂

[6543]

@jolheiser good catch - we already missed one version

[codecov-commenter]

Codecov Report

Merging #12709 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #12709      +/-   ##
==========================================
- Coverage   43.29%   43.27%   -0.02%     
==========================================
  Files         646      646              
  Lines       71567    71567              
==========================================
- Hits        30983    30974       -9     
- Misses      35562    35580      +18     
+ Partials     5022     5013       -9     

Impacted Files	Coverage Δ
services/pull/check.go	31.53% <0.00%> (-16.16%)	⬇️
modules/indexer/stats/queue.go	52.94% <0.00%> (-11.77%)	⬇️
modules/queue/unique_queue_channel.go	58.06% <0.00%> (-6.46%)	⬇️
models/unit.go	46.57% <0.00%> (-2.74%)	⬇️
routers/repo/view.go	37.33% <0.00%> (-0.65%)	⬇️
models/pull.go	54.54% <0.00%> (-0.63%)	⬇️
models/issue_comment.go	53.90% <0.00%> (+0.15%)	⬆️
modules/git/repo.go	49.74% <0.00%> (+0.50%)	⬆️
modules/queue/workerpool.go	60.00% <0.00%> (+1.22%)	⬆️
services/mirror/mirror.go	19.93% <0.00%> (+1.35%)	⬆️
... and 5 more

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