d01381f9

Author: Michael Lynch <git@mtlynch.io>

Migrate Go module to GitLab v3

Move ScreenJournal's public repository references and Go module path from
github.com/mtlynch/screenjournal/v2 to
gitlab.com/mtlynch/screenjournal/v3. This is a breaking import-path change
for downstream Go consumers.

Validation: dev-scripts/build-all-flake-targets