format(renovate): simplify regex patterns in config

- use glob pattern instead of regex where possible

.renovaterc.json

@@ -8,7 +8,7 @@
       "customType": "regex",
       "description": "k3s",
       "managerFilePatterns": [
-        "/playbook\\.yml/"
+        "playbook.yml"
       ],
       "matchStrings": [
         "\\s+k3s_version:\\s(?<currentValue>.*)"
@@ -20,7 +20,7 @@
       "customType": "regex",
       "description": "ArgoCD",
       "managerFilePatterns": [
-        "/^argocd-bootstrap/.*\\.yml$/"
+        "argocd-bootstrap/*.yml"
       ],
       "matchStrings": [
         "\\s+chart:\\s(?<depName>.*)",
@@ -34,7 +34,7 @@
       "customType": "regex",
       "description": "Baseline Manifests",
       "managerFilePatterns": [
-        "/\\.jsonnet$/"
+        "*.jsonnet"
       ],
       "matchStrings": [
         "\\s+chart::\\s\\\"(?<depName>.*)\\\",",