Log Message:
py-flask-mail: updated to 0.10.0

0.10.0

Drop support for Python < 3.8.
Use pyproject.toml for packaging metadata.
Use flit_core as build backend.
Apply code formatting and linting tools.
Add static type annotations.
Deprecate the __version__ attribute. Use feature detection or \ 
importlib.metadata.version("flask-mail") instead.
Indicate that the deprecated is_bad_headers will be removed in the next version.
Fix the email_dispatched signal to pass the current app as the sender and \ 
message as an argument, rather than the other way around.
Attachment.data may not be None.
Attachment.content_type will be detected based on filename and data and will not \ 
be None.