Add GitLab 15.3 changelog

@Normo Could you please check the Changelog entry for GitLab 15.3. Thanks :)

added Progress::4_Can review label

requested review from @Normo

assigned to @frust45

added Progress::5_Under review label and removed Progress::4_Can review label

Thanks, @frust45. Found a small typo. Feel free to merge.

resolved all threads

added 1 commit

• 4a88e678 - Fix typo in Changelog entry

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enabled an automatic merge when the pipeline for 4a88e678 succeeds

added Progress::6_Can merge label and removed Progress::5_Under review label

merged

mentioned in commit d22fa085