mautrix-telegram: fix build

With updating `pluggy` to `0.13.0`[1] the way how python modules are
imported during pytest changed which broke all modules that had a
`coding: future_fstrings` annotation at the top which used to be needed
for python <=3.5. This only affected the tests, deploying a
`mautrix-telegram` from master with `doCheck = false;` works fine.

I applied a patch for `mautrix-telegram` which drops python 3.5 compat
(this package is intended to be used as application with python 3.7, so this
should be fine on master/unstable) and modified `mautrix-appservice`
accordingly as a lot of things on master changed since their last
release, so applying a patch didn't work there.

Resolves #71996

[1] faf8cfba4ecd86186bb2d965f6d6386a08aba6a6

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