Bump test plugin code-server engine

chore(release): bump version to 3.12.0

chore(release): bump version to 3.11.1

chore(release): bump version to 3.11.0

refactor: remove extra step in release-prep.sh

Update changelog for 3.10.1

chore(ci): fix release scripts

chore(release): bump version to 3.9.3

chore(release): bump version to 3.9.2

Merge pull request coder#2819 from cdr/v3.9.1

release: 3.9.1