Update dependency nodemailer to ^6.9.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nodemailer (source)	^6.7.1 -> ^6.9.6

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Release Notes

nodemailer/nodemailer (nodemailer)

v6.9.6

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Bug Fixes

• inline: Use 'inline' as the default Content Dispostion value for embedded images (db32c93)
• tests: Removed Node v12 from test matrix as it is not compatible with the test framework anymore (7fe0a60)

v6.9.5

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Bug Fixes

• license: Updated license year (da4744e)

v6.9.4

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• Renamed SendinBlue to Brevo

v6.9.3

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• Specified license identifier (was defined as MIT, actual value MIT-0)
• If SMTP server disconnects with a message, process it and include as part of the response error

v6.9.2

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• Fix uncaught exception on invalid attachment content payload

v6.9.1

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• Fix base64 encoding for emoji bytes in encoded words

v6.9.0

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• Do not throw if failed to resolve IPv4 addresses
• Include EHLO extensions in the send response
• fix sendMail function: callback should be optional

v6.8.0

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• Add DNS timeout (huksley)
• add dns.REFUSED (lucagianfelici)

v6.7.8

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• Allow to use multiple Reply-To addresses

v6.7.7

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• Resolver fixes

v6.7.6

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v6.7.5

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• No changes, pushing a new README to npmjs.org

v6.7.4

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• Ensure compatibility with Node 18
• Replaced Travis with Github Actions

v6.7.3

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• Typo fixes
• Added stale issue automation fir Github
• Add Infomaniak config to well known service (popod)
• Update Outlook/Hotmail host in well known services (popod)
• fix: DSN recipient gets ignored (KornKalle)

v6.7.2

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• Fix proxies for account verification

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