upgrade juju-dependencies (#418)

upgrade juju dependencies:
- juju-agent 3.5.3 for CI pipeline
- juju 3.5.0 in pyproject.toml (cannot be upgraded to 3.5.2 due to
juju/python-libjuju#1093)

.github/workflows/ci.yaml

@@ -67,7 +67,7 @@ jobs:
       cache: true
 
   integration-test:
-    name: Integration test charm | 3.4.4
+    name: Integration test charm | 3.5.3
     needs:
       - lint
       - unit-test
@@ -76,7 +76,7 @@ jobs:
     with:
       artifact-prefix: packed-charm-cache-true
       cloud: lxd
-      juju-agent-version: 3.4.4
+      juju-agent-version: 3.5.3
       _beta_allure_report: true
     secrets:
       # GitHub appears to redact each line of a multi-line secret

pyproject.toml

@@ -76,7 +76,8 @@ pytest-operator = "^0.35.0"
 pytest-operator-cache = {git = "https://github.com/canonical/data-platform-workflows", tag = "v16.7.0", subdirectory = "python/pytest_plugins/pytest_operator_cache"}
 pytest-operator-groups = {git = "https://github.com/canonical/data-platform-workflows", tag = "v16.7.0", subdirectory = "python/pytest_plugins/pytest_operator_groups"}
 pytest-microceph = {git = "https://github.com/canonical/data-platform-workflows", tag = "v16.7.0", subdirectory = "python/pytest_plugins/microceph"}
-juju = "~3.4.0"
+# should not be updated unless https://github.com/juju/python-libjuju/issues/1093 is fixed
+juju = "~3.5.0"
 ops = "^2.15"
 tenacity = "^8.4.2"
 pyyaml = "^6.0.1"