fix: add encoding="utf-8" in file_processing.py

Author: dornech

generate_changelog/actions/file_processing.py

@@ -47,7 +47,7 @@ def __call__(self, input_text: StrOrCallable) -> StrOrCallable:
         """Writes input_text to the pre-configured file."""
         filepath = Path(eval_if_callable(self.filename))
         text = eval_if_callable(input_text)
-        filepath.write_text(text)
+        filepath.write_text(text, encoding="utf-8")
         return input_text
 
 
@@ -90,5 +90,5 @@ def __call__(self, input_text: StrOrCallable) -> StrOrCallable:
         else:
             new_text = text
 
-        filename.write_text(new_text)
+        filename.write_text(new_text, encoding="utf-8")
         return input_text