CI: group dependency updates #3801

Problem:
Dependency updates can be noisy. Unmerged dependency updates can block
other updates if the max is
reached.

Solution:
- Use dependabot "groups" feature: https://github.blog/2023-08-24-a-faster-way-to-manage-version-updates-with-dependabot/
    - Group updates to github actions.
    - Group updates to AWS SDK.
    - Group updates to vscode lsp packages.

.github/dependabot.yml

@@ -8,8 +8,21 @@ updates:
       target-branch: 'master' # Avoid updates to "staging".
       schedule:
           interval: 'daily'
-    # Check for updates to GitHub Actions every week
+      groups:
+          aws-sdk:
+              dependency-type: 'production'
+              patterns:
+                  - '@aws-sdk/*'
+          vscode-lsp:
+              dependency-type: 'production'
+              patterns:
+                  - 'vscode-lang*'
     - package-ecosystem: 'github-actions'
       directory: '/'
+      target-branch: 'master' # Avoid updates to "staging".
       schedule:
-          interval: 'weekly'
+          interval: 'daily'
+      groups:
+          github-actions:
+              patterns:
+                  - '*'