Replace Ubuntu bionic with jammy

Fixed python "3.10", requires quotes to get subversion 10.

.github/workflows/core-tests.yml

@@ -10,7 +10,7 @@ jobs:
       matrix:
         # This range ensures coding standard does not conflict with 
         #  changes in newer Pythons
-        python-version: [3.7, 3.8, 3.9, 3.10]
+        python-version: [3.7, 3.8, 3.9, "3.10"]
 
     steps:
     - uses: actions/checkout@v3

.github/workflows/jammy/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:bionic
+FROM ubuntu:jammy
 
 ENV DEBIAN_FRONTEND=noninteractive
 

.github/workflows/os-packages.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       max-parallel: 4
       matrix:
-        distro: [ buster, bionic, focal ]
+        distro: [ buster, jammy, focal ]
 
     steps:
     - uses: actions/checkout@v3