Feat/stackittpr 442 depedency cooldowns (#1233)

* feat(deps) configure 7 day cooldown for external dependencies

* feat(deps) remove renovate config in favor of dependabot

* fix(deps) manage internal vs external dependencies via cooldown.exclude

Author: cgoetz-inovex

.github/dependabot.yml

@@ -4,7 +4,12 @@ updates:
     directory: "/" 
     schedule:
       interval: "daily"
+    cooldown:
+        default-days: 7
+        exclude: ["github.com/stackitcloud*"]
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "daily"
+    cooldown:
+        default-days: 7