Update runner image to Jammy

Author: Alex-Welsh

.github/workflows/stackhpc-build-kayobe-image.yml

@@ -42,7 +42,7 @@ jobs:
   build-kayobe-image:
     name: Build kayobe image
     if: inputs.if || github.repository == 'stackhpc/stackhpc-kayobe-config' && github.event_name == 'push'
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     permissions:
       contents: read
       packages: write

.github/workflows/stackhpc-pull-request.yml

@@ -13,7 +13,7 @@ jobs:
   # would skip the workflow entirely, and would prevent us from making the
   # aio jobs required to pass (a skip counts as a pass).
   check-changes:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     permissions:
       pull-requests: read
     name: Check changed files