chore: renovate bot setting to pin actions to a full length commit SHA (#46060)

- https://docs.renovatebot.com/modules/manager/github-actions/#additional-information

- Pinned actions by SHA https://github.com/ossf/scorecard/blob/main/docs/checks.md#pinned-dependencies

>Pin actions to a full length commit SHA

>Pinning an action to a full length commit SHA is currently the only way to use an action as an immutable release.
> Pinning to a particular SHA helps mitigate the risk of a bad actor adding a backdoor to the action's repository,
> as they would need to generate a SHA-1 collision for a valid Git object payload.

- https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-third-party-actions
- b0c3aa85ef/default.json (L13)

renovate.json

@@ -1,5 +1,8 @@
 {
-  "extends": ["github>freecodecamp/renovate-config"],
+  "extends": [
+    "github>freecodecamp/renovate-config",
+    "helpers:pinGitHubActionDigests"
+  ],
   "packageRules": [
     {
       "groupName": "Monaco Editor",