Update dependency Flask_Mail to v0.10.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Flask_Mail (changelog)	== 0.9.1 → ==0.10.0

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Release Notes

pallets-eco/flask-mail (Flask_Mail)

v0.10.0

Compare Source

Released 2024-05-23

• 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.

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