chore: update charm libraries (#45)

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

lib/charms/loki_k8s/v0/loki_push_api.py

@@ -67,21 +67,20 @@ class LokiOperatorCharm(CharmBase):
           def __init__(self, *args):
               super().__init__(*args)
               ...
-              self._loki_ready()
+              external_url = urlparse(self._external_url)
+              self.loki_provider = LokiPushApiProvider(
+                  self,
+                  address=external_url.hostname or self.hostname,
+                  port=external_url.port or 80,
+                  scheme=external_url.scheme,
+                  path=f"{external_url.path}/loki/api/v1/push",
+              )
               ...
 
-          def _loki_ready(self):
-              try:
-                  version = self._loki_server.version
-                  self.loki_provider = LokiPushApiProvider(self)
-                  logger.debug("Loki Provider is available. Loki version: %s", version)
-              except LokiServerNotReadyError as e:
-                  self.unit.status = MaintenanceStatus(str(e))
-              except LokiServerError as e:
-                  self.unit.status = BlockedStatus(str(e))
-
-  - `port`: Loki Push Api endpoint port. Default value: 3100.
-  - `rules_dir`: Directory to store alert rules. Default value: "/loki/rules".
+  - `port`: Loki Push Api endpoint port. Default value: `3100`.
+  - `scheme`: Loki Push Api endpoint scheme (`HTTP` or `HTTPS`). Default value: `HTTP`
+  - `address`: Loki Push Api endpoint address. Default value: `localhost`
+  - `path`: Loki Push Api endpoint path. Default value: `loki/api/v1/push`
 
 
 The `LokiPushApiProvider` object has several responsibilities:
@@ -481,7 +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 = 19
+LIBPATCH = 20
 
 logger = logging.getLogger(__name__)