use str | None instead of optional

Signed-off-by: Jordan Dubrick <jdubrick@redhat.com>

Author: Jdubrick

docs/config.puml

@@ -303,7 +303,7 @@ class "UnifiedInferenceProvider" as src.models.config.UnifiedInferenceProvider {
   allowed_models : Optional[list[str]]
   api_key_env : Optional[str]
   extra : dict[str, object]
-  id : Optional[str]
+  id : str | None
   type : Literal['openai', 'ollama', 'vllm', 'sentence_transformers', 'azure', 'vertexai', 'watsonx', 'vllm_rhaiis', 'vllm_rhel_ai']
 }
 class "UnifiedLlamaStackConfig" as src.models.config.UnifiedLlamaStackConfig {

src/models/config.py

@@ -698,7 +698,7 @@ class UnifiedInferenceProvider(ConfigurationBase):
         "Llama Stack provider_type by the synthesizer.",
     )
 
-    id: Optional[str] = Field(
+    id: str | None = Field(
         None,
         title="Provider ID",
         description="Optional identifier emitted as the Llama Stack provider_id. "
@@ -730,7 +730,7 @@ class UnifiedInferenceProvider(ConfigurationBase):
 
     @field_validator("id")
     @classmethod
-    def validate_id(cls, value: Optional[str]) -> Optional[str]:
+    def validate_id(cls, value: str | None) -> str | None:
         """Strip and validate an optional high-level provider id.
 
         Parameters: