fix: k8s config to reference yaml file instead of json (#5)

Ups, something got messed up during migration. k8s manifests are of course of file type yaml and not json.

Reviewed-on: #5
Reviewed-by: branch-buddy <branch-buddy@t00n.de>
Co-authored-by: Timo Behrendt <t.behrendt@t00n.de>
Co-committed-by: Timo Behrendt <t.behrendt@t00n.de>

common.json

@@ -1,4 +1,5 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "dependencyDashboard": true
+  "dependencyDashboard": true,
+  "semanticCommits": "enabled"
 }

k8s.json

@@ -2,7 +2,7 @@
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
   "kubernetes": {
     "enabled": true,
-    "fileMatch": ["^k8s/*\\.json$"],
+    "fileMatch": ["^k8s/*\\.yaml$"],
     "labels": ["deps", "k8s"]
   }
 }