Update Ubuntu base image for GitHub Actions

.github/workflows/build-docker-image.yml

@@ -8,7 +8,7 @@ on:
 jobs:
   build:
     name: Update Docker Hub images
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Set up Docker Buildx

.github/workflows/draft-release-pr-check.yml

@@ -24,7 +24,7 @@ permissions:
 jobs:
   check-intent:
     name: Check release trigger
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     outputs:
       valid: ${{ steps.validate.outputs.DEV_BUILD == 'false' }}
@@ -43,7 +43,7 @@ jobs:
     #don't do these checks if this isn't a release - we don't want to generate unnecessary failed statuses
     if: needs.check-intent.outputs.valid == 'true'
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/draft-release.yml

@@ -23,7 +23,7 @@ env:
 jobs:
   skip:
     name: Check whether to ignore this tag
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     outputs:
       skip: ${{ steps.exists.outputs.exists == 'true' }}
@@ -54,7 +54,7 @@ jobs:
     needs: [check]
     if: needs.check.outputs.valid == 'true' && github.ref_type != 'tag' #can't do post-commit for a tag
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - name: Generate access token
@@ -79,7 +79,7 @@ jobs:
     needs: [check]
     if: needs.check.outputs.valid == 'true' || github.ref_type == 'tag' #ignore validity check for tags
 
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
 
     steps:
       - uses: actions/checkout@v4

.github/workflows/main-php-matrix.yml

@@ -15,7 +15,7 @@ on:
         type: number
       image:
         description: 'Runner image to use'
-        default: 'ubuntu-20.04'
+        default: 'ubuntu-22.04'
         type: string
 
 jobs:

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
 
   codestyle:
     name: Code Style checks
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false
 
@@ -40,7 +40,7 @@ jobs:
 
   shellcheck:
     name: ShellCheck
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     strategy:
       fail-fast: false