Fix the text tokenizer name in logger warning of PixArt pipelines (#7912)

Fix CLIP to T5 in logger warning

Author: liang-hou

src/diffusers/pipelines/pixart_alpha/pipeline_pixart_alpha.py

@@ -366,7 +366,7 @@ def encode_prompt(
             ):
                 removed_text = self.tokenizer.batch_decode(untruncated_ids[:, max_length - 1 : -1])
                 logger.warning(
-                    "The following part of your input was truncated because CLIP can only handle sequences up to"
+                    "The following part of your input was truncated because T5 can only handle sequences up to"
                     f" {max_length} tokens: {removed_text}"
                 )
 

src/diffusers/pipelines/pixart_alpha/pipeline_pixart_sigma.py

@@ -292,7 +292,7 @@ def encode_prompt(
             ):
                 removed_text = self.tokenizer.batch_decode(untruncated_ids[:, max_length - 1 : -1])
                 logger.warning(
-                    "The following part of your input was truncated because CLIP can only handle sequences up to"
+                    "The following part of your input was truncated because T5 can only handle sequences up to"
                     f" {max_length} tokens: {removed_text}"
                 )