Switch to ubuntu-22.04 for CI tests

An issue with oscrypto means it currently does not work on 24.04. Ref: wbond/oscrypto#78 (comment)

Author: pjrobertson

.github/workflows/tests-core.yaml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version: ["3.10", "3.11", "3.12"]
@@ -46,8 +46,8 @@ jobs:
       - name: Install project
         run: poetry install --no-interaction
 
-      - name: Run Download Tests
+      - name: Run Core Tests
         run: |
           source .venv/bin/activate
-          pytest -ra -v -m "download"
+          pytest -ra -v -m "not download"
           coverage report

.github/workflows/tests-download.yaml

@@ -10,7 +10,7 @@ on:
 
 jobs:
   tests:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version: ["3.10"] # only run expensive downloads on one (lowest) python version