Make cos_agent lib compatible with Pydantic v1/v2 (#156)

lib/charms/grafana_agent/v0/cos_agent.py

@@ -213,14 +213,18 @@ def __init__(self, *args):
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Callable, ClassVar, Dict, List, Optional, Set, Tuple, Union
 
-import pydantic
 from cosl import GrafanaDashboard, JujuTopology
 from cosl.rules import AlertRules
 from ops.charm import RelationChangedEvent
 from ops.framework import EventBase, EventSource, Object, ObjectEvents
 from ops.model import Relation
 from ops.testing import CharmType
 
+try:
+    import pydantic.v1 as pydantic
+except ImportError:
+    import pydantic
+
 if TYPE_CHECKING:
     try:
         from typing import TypedDict
@@ -234,9 +238,9 @@ class _MetricsEndpointDict(TypedDict):
 
 LIBID = "dc15fa84cef84ce58155fb84f6c6213a"
 LIBAPI = 0
-LIBPATCH = 8
+LIBPATCH = 9
 
-PYDEPS = ["cosl", "pydantic < 2"]
+PYDEPS = ["cosl", "pydantic"]
 
 DEFAULT_RELATION_NAME = "cos-agent"
 DEFAULT_PEER_RELATION_NAME = "peers"