disallow latest sphinx release because it doesn't work with sphinx_rt…

…d_theme (#1147)

* disallow latest sphinx release because it doesn't work with sphinx_rtd_theme

* Update test_ssl.py

* black

setup.py

@@ -100,6 +100,6 @@ def find_meta(meta):
         ],
         extras_require={
             "test": ["flaky", "pretend", "pytest>=3.0.1"],
-            "docs": ["sphinx", "sphinx_rtd_theme"],
+            "docs": ["sphinx!=5.2.0,!=5.2.0.post0", "sphinx_rtd_theme"],
         },
     )

tests/test_ssl.py

@@ -218,6 +218,8 @@ def socket_pair():
     client.setblocking(True)
     server = port.accept()[0]
 
+    port.close()
+
     # Let's pass some unencrypted data to make sure our socket connection is
     # fine.  Just one byte, so we don't have to worry about buffers getting
     # filled up or fragmentation.