chore(deps): group dependabot nuget and actions updates (#41)

Bundle nuget minor/patch version updates into one weekly PR and
security updates into a separate PR. Group all github-actions bumps
into a single PR. Major nuget updates stay ungrouped so breaking
changes are reviewed individually.

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

Author: HandyS11

.github/dependabot.yml

@@ -9,8 +9,22 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+    groups:
+      nuget-minor-and-patch:
+        applies-to: version-updates
+        update-types:
+          - "minor"
+          - "patch"
+      nuget-security:
+        applies-to: security-updates
+        patterns:
+          - "*"
 
   - package-ecosystem: github-actions
     directory: "/"
     schedule:
       interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"