Bump flask-mail from 0.9.1 to 0.10.0

Bumps [flask-mail](https://github.com/pallets-eco/flask-mail) from 0.9.1 to 0.10.0.
- [Release notes](https://github.com/pallets-eco/flask-mail/releases)
- [Changelog](https://github.com/pallets-eco/flask-mail/blob/main/CHANGES.md)
- [Commits](pallets-eco/flask-mail@0.9.1...0.10.0)

---
updated-dependencies:
- dependency-name: flask-mail
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

src/requirements.txt

@@ -1,4 +1,4 @@
-Flask-Mail==0.9.1
+Flask-Mail==0.10.0
 flask-session==0.8.0
 Flask-WTF==1.2.1
 Flask==3.0.*