Add changelog entries for GitLab v15.5 and v15.6

Closes #76 (closed)

assigned to @hueser93

added Progress::3_Doing label

added Progress::4_Can review label and removed Progress::3_Doing label

requested review from @Normo

Dear Norman @Normo, would you be so kind to review these two changelog entries? Thanks a lot.

approved this merge request

added Progress::6_Can merge label and removed Progress::4_Can review label

merged

mentioned in commit d929e85b