Update dependency libjuju 2 to v2.9.49.0 (#462)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -52,7 +52,7 @@ jobs:
       matrix:
         juju:
           - agent: 2.9.49  # renovate: latest juju 2
-            libjuju: ==2.9.46.1  # renovate: latest libjuju 2
+            libjuju: ==2.9.49.0  # renovate: latest libjuju 2
             allure: false
           - agent: 3.1.8  # renovate: latest juju 3
             allure: true