deps: Grouping deps for dependabot (#7484)

Signed-off-by: Johan Fylling <[email protected]>

Author: johanfylling

Diff for: .github/dependabot.yml

@@ -6,9 +6,18 @@ updates:
       interval: monthly
     groups:
       go.opentelemetry.io:
-          patterns:
-            - "go.opentelemetry.io/*"
+        patterns:
+          - "go.opentelemetry.io/*"
+      dependencies:
+        patterns:
+          - "*"
+        exclude-patterns:
+          - "go.opentelemetry.io/*"
   - package-ecosystem: github-actions
     directory: /
     schedule:
       interval: monthly
+    groups:
+      gha-dependencies:
+        patterns:
+          - "*"