Update CI workflow

- Relates to issue #134.

.github/workflows/ci.yml

@@ -1,5 +1,5 @@
 name: Moodle Plugin CI
-# Based on version gha.dist.yml version 4.1.2
+# Based on version gha.dist.yml version 4.5.2
 
 on:
   push:
@@ -38,12 +38,12 @@ jobs:
       fail-fast: false
       matrix:
         php: ['8.0', '8.1', '8.2']
-        moodle-branch: ['MOODLE_403_STABLE']
+        moodle-branch: ['MOODLE_404_STABLE']
         database: [pgsql, mariadb]
 
     steps:
       - name: Check out repository code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: plugin
 
@@ -77,11 +77,6 @@ jobs:
         if: ${{ !cancelled() }}
         run: moodle-plugin-ci phplint
 
-      - name: PHP Copy/Paste Detector
-        continue-on-error: true # This step will show errors but will not fail
-        if: ${{ !cancelled() }}
-        run: moodle-plugin-ci phpcpd
-
       # For now, assume this succeeds.
       - name: PHP Mess Detector
         continue-on-error: true # This step will show errors but will not fail