ci: sync with netresearch/.github templates/go-app

Auto-generated by scripts/sync-template.sh. Any changes you want to keep
must be declared in .github/template.yaml's intentional-drift: list — the
check-template-drift.yml job will otherwise revert them on next sync.

Signed-off-by: Sebastian Mendel <info@sebastianmendel.de>

Author: CybotTM

.github/dependabot.yml

@@ -36,3 +36,6 @@ updates:
       interval: weekly
       day: monday
     open-pull-requests-limit: 2
+    groups:
+      devcontainers:
+        patterns: ['*']