Update to Redmine 5.1.4 and redmine_oauth to 2.2.8

• https://www.redmine.org/projects/redmine/wiki/Changelog_5_1#514-2024-11-03
• https://github.com/kontron/redmine_oauth/releases

requested review from @steiner

assigned to @grossberndts

mentioned in issue server/team#131

approved this merge request

changed the description

mentioned in commit 1865a695

merged