fix(deps): update dependency flask-mailman to v1.1.0

This MR contains the following updates:

Package	Type	Update	Change
flask-mailman	dependencies	minor	1.0.0 -> 1.1.0

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Release Notes

waynerv/flask-mailman (flask-mailman)

v1.1.0

Compare Source

• Add configuration key MAIL_SEND_OPTIONS to support setting mail_options for smtplib.SMTP.send_mail (e.g. SMTPUTF8) (#​61).
• Pre-encodes FQDN str with punycode to improve compatibility (#​66).
• Migrates as many as possible test cases from Django mail module (#​64).
• Improve way of populating smtp key/cert to avoid TypeError in py>=12 (#​68).

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