fix(ci): group vitest and @vitest/* updates in dependabot (#21)

vitest and @vitest/coverage-v8 share a strict peer dependency. Bumping them
in separate Dependabot PRs breaks npm ci. Grouping them ensures they stay
in lockstep.

Co-authored-by: adam <166072409+amoussa1229@users.noreply.github.com>

.github/dependabot.yml

@@ -1,29 +1,37 @@
 version: 2
 updates:
-  - package-ecosystem: "npm"
-    directory: "/"
+  - package-ecosystem: 'npm'
+    directory: '/'
     schedule:
-      interval: "weekly"
+      interval: 'weekly'
     groups:
       minor-and-patch:
         update-types:
-          - "minor"
-          - "patch"
-  - package-ecosystem: "npm"
-    directory: "/infra"
+          - 'minor'
+          - 'patch'
+      vitest:
+        patterns:
+          - 'vitest'
+          - '@vitest/*'
+  - package-ecosystem: 'npm'
+    directory: '/infra'
     schedule:
-      interval: "weekly"
+      interval: 'weekly'
     groups:
       minor-and-patch:
         update-types:
-          - "minor"
-          - "patch"
-  - package-ecosystem: "github-actions"
-    directory: "/"
+          - 'minor'
+          - 'patch'
+      vitest:
+        patterns:
+          - 'vitest'
+          - '@vitest/*'
+  - package-ecosystem: 'github-actions'
+    directory: '/'
     schedule:
-      interval: "weekly"
+      interval: 'weekly'
     groups:
       minor-and-patch:
         update-types:
-          - "minor"
-          - "patch"
+          - 'minor'
+          - 'patch'