Refresh the patch

nix/setup.cfg.patch

 diff --git a/setup.cfg b/setup.cfg
-index 3856a101..371a19b3 100644
+index dfc49607..822ea8dd 100644
 --- a/setup.cfg
 +++ b/setup.cfg
-@@ -38,7 +38,7 @@ install_requires =
-     python-challenge-bypass-ristretto
-     # Inherit our Twisted dependency from tahoe-lafs so we don't accidentally
-     # get the extras wrong here and break stuff.
+@@ -40,7 +40,7 @@ install_requires =
+     # incompatible with Tahoe-LAFS'.  So duplicate them here (the ones that
+     # have been observed to cause problems).
+     Twisted[tls,conch]>=18.4.0
 -    tahoe-lafs==1.14.0
 +    tahoe-lafs
      treq