test: update tested ZK versions

Latest EOL is 3.6, and 3.9 is here now

Author: StephenSorriaux

.github/workflows/testing.yml

@@ -53,7 +53,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.10-v7.3.15"]
-        zk-version: ["3.4.14", "3.5.10", "3.6.3", "3.7.1"]
+        zk-version: ["3.6.4", "3.7.2", "3.8.3", "3.9.1"]
         include:
           - python-version: "3.8"
             tox-env: py38
@@ -153,7 +153,7 @@ jobs:
       - name: Test with tox
         run: tox -e py310
         env:
-          ZOOKEEPER_VERSION: 3.7.1
+          ZOOKEEPER_VERSION: 3.9.1
           ZOOKEEPER_PREFIX: "apache-"
           ZOOKEEPER_SUFFIX: "-bin"
           ZOOKEEPER_LIB: "lib"