[CI] Fix accidental revert of Twisted pin for Windows

In commit 9d802b2 I pushed a change to tests which included a revert of
Windows pinned dependencies which was an accident. The actual change
should only have reverted setup.py pinned dependency since we down want
a release to not be able to use a later fixed version of Twisted.

requirements.txt

@@ -1,5 +1,6 @@
 libtorrent
 twisted[tls]>=17.1
+twisted[tls]<23,>=17.1; sys_platform == 'win32'
 rencode
 pyopenssl
 pyxdg