chore: update charm libraries

lib/charms/observability_libs/v0/kubernetes_compute_resources_patch.py

@@ -133,7 +133,7 @@ def setUp(self, *unused):
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 5
+LIBPATCH = 6
 
 
 _Decimal = Union[Decimal, float, str, int]  # types that are potentially convertible to Decimal
@@ -366,7 +366,7 @@ def is_patched(self, resource_reqs: ResourceRequirements) -> bool:
         """
         return equals_canonically(self.get_templated(), resource_reqs)
 
-    def get_templated(self) -> ResourceRequirements:
+    def get_templated(self) -> Optional[ResourceRequirements]:
         """Returns the resource limits specified in the StatefulSet template."""
         statefulset = self.client.get(
             StatefulSet, name=self.statefulset_name, namespace=self.namespace
@@ -377,7 +377,7 @@ def get_templated(self) -> ResourceRequirements:
         )
         return podspec_tpl.resources
 
-    def get_actual(self, pod_name: str) -> ResourceRequirements:
+    def get_actual(self, pod_name: str) -> Optional[ResourceRequirements]:
         """Return the resource limits that are in effect for the container in the given pod."""
         pod = self.client.get(Pod, name=pod_name, namespace=self.namespace)
         podspec = self._get_container(