ops: update ci workflow to latest versions

.github/workflows/ci.yml

@@ -4,11 +4,11 @@ on: [push, pull_request]
 
 jobs:
   test:
-    runs-on: ubuntu-18.04
+    runs-on: ubuntu-latest
 
     services:
       postgres:
-        image: postgres:12
+        image: postgres:13
         env:
           POSTGRES_USER: 'postgres'
           POSTGRES_HOST_AUTH_METHOD: 'trust'
@@ -19,33 +19,20 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: ['7.3', '7.4', '8.0']
+        php: ['8.1']
         moodle-branch:
           [
-            'MOODLE_39_STABLE',
-            'MOODLE_310_STABLE',
-            'MOODLE_311_STABLE',
-            'MOODLE_400_STABLE',
-            'MOODLE_401_STABLE'
+            'MOODLE_403_STABLE'
           ]
         database: [pgsql]
-        exclude:
-          # Exclude Moodle+PHP incompatible versions
-          # See: https://docs.moodle.org/dev/Moodle_and_PHP
-          - moodle-branch: 'MOODLE_401_STABLE'
-            php: '7.3'
-          - moodle-branch: 'MOODLE_39_STABLE'
-            php: '8.0'
-          - moodle-branch: 'MOODLE_310_STABLE'
-            php: '8.0'
 
     steps:
       - name: Get branch name
         id: branch-name
         uses: tj-actions/branch-names@v5.2
 
       - name: Check out repository code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
           path: plugin