; Mark test for erc--update-channel-modes as :unstable

; Mark test for erc--update-channel-modes as :unstable

* test/lisp/erc/erc-scenarios-auth-source.el
(erc-scenarios-common--auth-source): Extend timeout.
* test/lisp/erc/erc-scenarios-base-buffer-display.el
(erc-scenarios-base-buffer-display--count-reset-timeout): Await
initial condition.
* test/lisp/erc/erc-scenarios-base-renick.el
(erc-scenarios-base-renick-queries-solo): Extend timeout.
* test/lisp/erc/erc-scenarios-misc.el (erc-scenarios-base-flood):
Extend timeout.
* test/lisp/erc/erc-tests.el (erc--channel-modes): Mark test as
:unstable pending further investigation.  This test has been shown to
be unreliable, possibly because it expects Emacs to report characters
being a certain width in all environments.  Thanks to Mattias
Engdegård for reporting this failure.
* test/lisp/erc/resources/base/reuse-buffers/server/barnet.eld:
Extend timeouts.
* test/lisp/erc/resources/base/reuse-buffers/server/foonet.eld:
Extend timeouts.