Mew version 6.11

[Kazu Yamamoto]

Hello,

Mew version 6.11 is now available:

https://www.mew.org/Release/mew-6.11.tar.gz

## Differences between Mew 6.11 and Mew 6.10

* Supporting coming Emacs 31.
* Removing fallback code from the "submission" port to the "smtp" port.
* `mew-smtp-port` is now defined as `"submission"` instead of `"smtp"`.
* Remove STARTTLS parameters for non-STARTTLS connections with GnuTLS
[#212](github.com/kazu-yamamoto/Mew/pull/212)
* Fix: BIMI logo color
[#210](github.com/kazu-yamamoto/Mew/pull/210)
* Support "BIMI-Indicator:" Header
[#208](github.com/kazu-yamamoto/Mew/pull/208)
* Hiding UI- in Message Mode
[#204](https://github.com/kazu-yamamoto/Mew/pull/204)
* Fix master password issues / Add Asymmetric (public key) encryption support
[#201](https://github.com/kazu-yamamoto/Mew/pull/201)

--Kazu