fix(schemas): replaced deprecated regex with pattern in Pydantic v2 schemas.py

app/models/schemas.py

@@ -25,14 +25,14 @@ class TranslationRequest(BaseModel):
         ...,
         example="eng_Latn",
         description="Target language in FLORES-200 format (e.g., eng_Latn for English)",
-        regex=r"^[a-z]{3}_[A-Z][a-z]{3}$",
+        pattern=r"^[a-z]{3}_[A-Z][a-z]{3}$",
         title="Target Language Code"
     )
     source_language: Optional[str] = Field(
         None,
         example="swh_Latn",
         description="Source language in FLORES-200 format. If not provided, language will be auto-detected",
-        regex=r"^[a-z]{3}_[A-Z][a-z]{3}$",
+        pattern=r"^[a-z]{3}_[A-Z][a-z]{3}$",
         title="Source Language Code (Optional)"
     )