Merge pull request #853 from charmed-kubernetes/issues/852/add-lunar-and-mantic

#853

#### Description

Addes mantic and lunar as ubuntu series

Fixes: #852

Author: jujubot

juju/utils.py

@@ -292,6 +292,8 @@ def get_local_charm_charmcraft_yaml(path):
 IMPISH = "impish"
 JAMMY = "jammy"
 KINETIC = "kinetic"
+LUNAR = "lunar"
+MANTIC = "mantic"
 
 UBUNTU_SERIES = {
     PRECISE: "12.04",
@@ -316,6 +318,8 @@ def get_local_charm_charmcraft_yaml(path):
     IMPISH: "21.10",
     JAMMY: "22.04",
     KINETIC: "22.10",
+    LUNAR: "23.04",
+    MANTIC: "23.10",
 }