fix-#1856: adjust websockets version to setup.py and make nightly (py39) tests pass

[DavidBord]

Fixes #1856

[codecov]

Codecov Report

Merging #1857 into master will decrease coverage by 3.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1857      +/-   ##
==========================================
- Coverage   94.81%   91.62%   -3.19%     
==========================================
  Files          24       27       +3     
  Lines        2314     2998     +684     
  Branches      422      544     +122     
==========================================
+ Hits         2194     2747     +553     
- Misses         75      172      +97     
- Partials       45       79      +34     

Impacted Files	Coverage Δ
sanic/websocket.py	88.63% <ø> (ø)
sanic/server.py	74.33% <0.00%> (ø)
sanic/blueprints.py	95.94% <0.00%> (ø)

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[ahopkins]

Looks like we do not even want to be using 0.7.0 any more. I do not think this is the right version to be setting this too.

python-websockets/websockets#760 (comment)

[DavidBord]

@ahopkins you want me to change the minimal supported websockets version to be 8.1?

[ahopkins]

Yes. let's see what it breaks. I think there was a change with the handling of subprotocols.

Or, perhaps even better, rather than dropping that out now, let's throw a warning in there (if using v7) that we will up the requirements after the next LTS.

[DavidBord]

@ahopkins to accomplish what you wrote in your last comment I think we'll have to either have non matching websockets versions between setup.py & tox.ini or keep py3.9 tests failing.

[Tronic]

Unrelated test failure, possibly a random mishap in test_reloader that'll need to be addressed in another PR. This one is good to go if only the test failure can be bypassed/ignored.