Change: Group Dependabot updates into single PR

This groups multiple dependency updates into a single pull request when
they are submitted by Dependabot.

The ability to process dependency updates through a single pull request
reduces the workload for repository maintenance.

See
https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#groups
for details on this functionality.

.github/dependabot.yml

@@ -5,9 +5,17 @@ updates:
     schedule:
       interval: weekly
       time: "04:00"
+    groups:
+      python-packages:
+        patterns:
+          - "*"
     open-pull-requests-limit: 10
 
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
       interval: "weekly"
+    groups:
+      github-actions:
+        patterns:
+          - "*"