update CI from Ubuntu 20.04 to 22.04

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   getVersionNumber:
     name: Get version number
     if: "startsWith(github.ref, 'refs/tags/') && !contains(github.event.head_commit.message, '[skip ci]') && github.actor != 'allcontributors'"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     outputs:
       version: ${{ steps.get-version-number.outputs.version }}
     steps:
@@ -23,15 +23,15 @@ jobs:
   build:
     name: Lint, test, and compile documentation
     if: "!contains(github.event.head_commit.message, '[skip ci]') && github.actor != 'allcontributors'"
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
         with:
           fetch-depth: 1
 
       - name: Install Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v5
         with:
           python-version: '3.9.9' # no particular microversion of 3.9 is required; 3.9.8 behaves oddly in GitHub actions
 
@@ -116,7 +116,7 @@ jobs:
   release:
     name: Release a new version
     needs: [getVersionNumber, build]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v2