Repo File Sync: Update CodeQL workflow trigger (#387)

synced local file(s) with
[microsoft/mu_devops](https://github.com/microsoft/mu_devops).

🤖: View the [Repo File Sync Configuration
File](https://github.com/microsoft/mu_devops/blob/main/.sync/Files.yml)
to see how files are synced.

---

This PR was created automatically by the
[repo-file-sync-action](https://github.com/BetaHuhn/repo-file-sync-action)
workflow run
[#4875054279](https://github.com/microsoft/mu_devops/actions/runs/4875054279)

Signed-off-by: Project Mu UEFI Bot <uefibot@microsoft.com>
(cherry picked from commit 81b6bf6)

.github/workflows/codeql.yml

@@ -26,7 +26,7 @@ on:
     branches:
       - main
       - release/*
-  pull_request_target:
+  pull_request:
     branches:
       - main
       - release/*