fix: correct dependabot.yml groups configuration

- Replace 'multi-ecosystem-group' with proper 'groups' syntax
- Add required 'patterns' property with wildcard matcher
- Group all dependencies per ecosystem for cleaner PRs
- Fixes dependabot configuration validation error

.github/dependabot.yml

@@ -5,33 +5,51 @@
 
 version: 2
 updates:
-  - package-ecosystem: "uv" # See documentation for possible values
-    directory: "/" # Location of package manifests
+  - package-ecosystem: "uv"
+    directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"
   - package-ecosystem: "bun"
     directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"
   - package-ecosystem: "docker"
     directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"
   - package-ecosystem: "docker-compose"
     directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"
   - package-ecosystem: "devcontainers"
     directory: "/"
     schedule:
       interval: "monthly"
-    multi-ecosystem-group: "all"
+    groups:
+      all:
+        patterns:
+          - "*"