chore: update charm libraries (#184)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

lib/charms/loki_k8s/v0/loki_push_api.py

@@ -456,7 +456,7 @@ def _alert_rules_error(self, event):
 from urllib.error import HTTPError
 
 import yaml
-from charms.observability_libs.v0.juju_topology import JujuTopology
+from cosl import JujuTopology
 from ops.charm import (
     CharmBase,
     HookEvent,
@@ -480,7 +480,7 @@ def _alert_rules_error(self, event):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 24
+LIBPATCH = 25
 
 logger = logging.getLogger(__name__)