Update python/dify_plugin/core/entities/plugin/request.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: utsumi-fj

python/dify_plugin/core/entities/plugin/request.py

@@ -203,7 +203,7 @@ class ModelInvokeTextEmbeddingRequest(PluginAccessModelRequest):
     action: ModelActions = ModelActions.InvokeTextEmbedding
 
     texts: list[str]
-    input_type: EmbeddingInputType | None = EmbeddingInputType.DOCUMENT
+    input_type: EmbeddingInputType = EmbeddingInputType.DOCUMENT
 
 
 class ModelInvokeMultimodalEmbeddingRequest(PluginAccessModelRequest):