Use ubuntu latest in all jobs

.github/workflows/assets.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   js:
     name: "Building assets"
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
 
     steps:
       - name: "Checkout"

.github/workflows/coding-standards.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   coding-standards:
     name: "CS Fixer, PHPStan & TwigCS"
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
 
     steps:
       - name: "Checkout"

.github/workflows/continuous-integration.yml

@@ -14,7 +14,7 @@ env:
 jobs:
   phpunit:
     name: "PHP ${{ matrix.php }} using ${{ matrix.database }}"
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
     services:
       rabbitmq:
         image: rabbitmq:3-alpine
@@ -83,7 +83,7 @@ jobs:
 
   phpunit_no_prefix:
     name: "PHP ${{ matrix.php }} using ${{ matrix.database }} without prefix"
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
     services:
       rabbitmq:
         image: rabbitmq:3-alpine

.github/workflows/translations.yml

@@ -13,7 +13,7 @@ permissions:
 jobs:
   translations:
     name: "Translations"
-    runs-on: "ubuntu-20.04"
+    runs-on: ubuntu-latest
 
     strategy:
       matrix: