Remove Python 3.13 for now, use older Ubuntu for behave

Author: avandras

.github/workflows/tests.yaml

@@ -18,7 +18,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-latest, macos-latest]
-        python-version: [3.7, 3.8, 3.9, '3.10', 3.11, 3.13]
+        python-version: [3.7, 3.8, 3.9, '3.10', 3.11]
         exclude:
           - os: macos-latest
             python-version: 3.7
@@ -77,7 +77,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest]
+        os: [ubuntu-22.04]
         python-version: [3.7, 3.13]
         dcs: [etcd, etcd3, consul, exhibitor, kubernetes, raft]
         include: