[Kubernetes] Accept PEP 585 'dict[K, V]' type strings in pod_config validator

kubernetes client >=36 regenerated its models with PEP 585 style type
strings, so map fields like metadata.labels now declare 'dict[str, str]'
instead of the old 'dict(str, str)'. The pod_config validator only matched
the parenthesized form, so the bracket form fell through to the model-import
path and failed with ModuleNotFoundError (No module named
'kubernetes.client.models.dict[str, str]'), breaking sky serve up / launch.
Accept both bracket styles.

Author: Hoipang

sky/provision/kubernetes/utils.py

@@ -2245,8 +2245,11 @@ def __validate(cls, data, klass):
                 sub_kls = match.group(1)
                 return [cls.__validate(sub_data, sub_kls) for sub_data in data]
 
-            if klass.startswith('dict('):
-                match = re.match(r'dict\(([^,]*), (.*)\)', klass)
+            # kubernetes client <36 emits map types as 'dict(str, V)';
+            # >=36 regenerated models use PEP 585 style 'dict[str, V]'.
+            # Accept both bracket styles.
+            if klass.startswith('dict(') or klass.startswith('dict['):
+                match = re.match(r'dict[(\[]([^,]*), (.*)[)\]]', klass)
                 if match is None:
                     raise ValueError(f'Invalid dict type format: {klass}')
                 sub_kls = match.group(2)