Use ubuntu-latest for all GitHub actions

Author: mbabker

.github/workflows/coding-standards.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   php-coding-standards:
     name: "PHP-CS-Fixer"
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
 
     steps:
       - name: "Checkout"

.github/workflows/continuous-integration.yml

@@ -12,7 +12,7 @@ env:
 jobs:
   phpunit:
     name: "PHPUnit ${{ matrix.php-version }} (${{ matrix.deps }})${{ matrix.no-annotations == true && ' - Without Annotations' || '' }}${{ matrix.orm != '' && format(' - ORM {0}', matrix.orm) || '' }}"
-    runs-on: "ubuntu-20.04"
+    runs-on: "ubuntu-latest"
 
     services:
       mongo:
@@ -125,7 +125,7 @@ jobs:
 
   upload_coverage:
     name: "Upload coverage to Codecov"
-    runs-on: "ubuntu-22.04"
+    runs-on: "ubuntu-latest"
     needs:
       - "phpunit"