ci: update github action checkout to v4

Use v4 github action checkout
Update dependabot to include the "ci: " prefix in commit/pr titles
for PR title checking.
Tell dependabot to check weekly instead of monthly

Signed-off-by: Rich Megginson <[email protected]>

.github/dependabot.yml

@@ -4,4 +4,6 @@ updates:
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: monthly
+      interval: weekly
+    commit-message:
+      prefix: ci

README.md

@@ -1,6 +1,6 @@
 # timesync
 
-[![ansible-lint.yml](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-lint.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-lint.yml) [![ansible-test.yml](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-test.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-test.yml) [![markdownlint.yml](https://github.com/linux-system-roles/timesync/actions/workflows/markdownlint.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/markdownlint.yml) [![shellcheck.yml](https://github.com/linux-system-roles/timesync/actions/workflows/shellcheck.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/shellcheck.yml) [![woke.yml](https://github.com/linux-system-roles/timesync/actions/workflows/woke.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/woke.yml)
+[![woke.yml](https://github.com/linux-system-roles/timesync/actions/workflows/woke.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/woke.yml) [![shellcheck.yml](https://github.com/linux-system-roles/timesync/actions/workflows/shellcheck.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/shellcheck.yml) [![markdownlint.yml](https://github.com/linux-system-roles/timesync/actions/workflows/markdownlint.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/markdownlint.yml) [![ansible-test.yml](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-test.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-test.yml) [![ansible-lint.yml](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-lint.yml/badge.svg)](https://github.com/linux-system-roles/timesync/actions/workflows/ansible-lint.yml)
 
 This role installs and configures an NTP and/or PTP implementation to operate
 <!--- wokeignore:rule=slave -->