ISSUE-345: update runner

Author: tatevikg1

.github/workflows/ci.yml

@@ -3,7 +3,7 @@ on: [push, pull_request]
 jobs:
   main:
     name: phpList on PHP ${{ matrix.php-versions }} [Build, Test]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     env:
       DB_DATABASE: phplist
       DB_USERNAME: root

.github/workflows/core-docs.yml

@@ -3,7 +3,7 @@ on: [push, pull_request]
 jobs:
   make-restapi-docs:
     name: Checkout phpList core and generate docs using `phpDocumentor`
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout
         uses: actions/checkout@v3