chore: move repositories to GovOPlaN organization

tools/checks/check-release-integration.sh

@@ -226,7 +226,7 @@ PY
 run_step "Clone release module test sources"
 for repo in govoplan-mail govoplan-calendar govoplan-campaign; do
   repo_tag="$(release_tag_for_package "$repo")"
-  git clone --depth 1 --branch "$repo_tag" "git@git.add-ideas.de:add-ideas/${repo}.git" "$WORK_ROOT/$repo"
+  git clone --depth 1 --branch "$repo_tag" "git@git.add-ideas.de:GovOPlaN/${repo}.git" "$WORK_ROOT/$repo"
 done
 
 run_step "Run core backend release tests"