gh action updates

.github/workflows/main.yaml

@@ -12,6 +12,8 @@ jobs:
   lint-unit:
     name: Lint Unit
     uses: charmed-kubernetes/workflows/.github/workflows/lint-unit.yaml@main
+    with:
+      python: "['3.8', '3.9', '3.10', '3.11']"
     needs:
       - call-inclusive-naming-check 
 
@@ -22,14 +24,15 @@ jobs:
       - lint-unit
     steps:
       - name: Check out code
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
-          python-version: 3.9
+          python-version: "3.10"
       - name: Setup operator environment
         uses: charmed-kubernetes/actions-operator@main
         with:
           provider: lxd
+          juju-channel: 3/stable
       - name: Run integration test
         run: tox -e integration

tox.ini

@@ -28,5 +28,5 @@ deps =
     pytest
     pytest-operator
     ipdb
-    juju < 3.0  # https://github.com/juju/python-libjuju/issues/719
+    juju
 commands = pytest --tb native --show-capture=no --log-cli-level=INFO -s {posargs} {toxinidir}/tests/integration