Bump prepackage GitLab plugin version to 1.9.1 (#27044)

server/Makefile

@@ -146,7 +146,7 @@ TEMPLATES_DIR=templates
 PLUGIN_PACKAGES ?= $(PLUGIN_PACKAGES:)
 PLUGIN_PACKAGES += mattermost-plugin-calls-v0.27.0
 PLUGIN_PACKAGES += mattermost-plugin-github-v2.2.0
-PLUGIN_PACKAGES += mattermost-plugin-gitlab-v1.9.0
+PLUGIN_PACKAGES += mattermost-plugin-gitlab-v1.9.1
 PLUGIN_PACKAGES += mattermost-plugin-jira-v4.1.1
 PLUGIN_PACKAGES += mattermost-plugin-playbooks-v1.39.3
 PLUGIN_PACKAGES += mattermost-plugin-nps-v1.3.3