fixes #1143 -- pin cryptography max version to prevent future pain (#…

…1145)

setup.py

@@ -96,7 +96,7 @@ def find_meta(meta):
         package_dir={"": "src"},
         install_requires=[
             # Fix cryptographyMinimum in tox.ini when changing this!
-            "cryptography>=37.0.2",
+            "cryptography>=37.0.2,<39",
         ],
         extras_require={
             "test": ["flaky", "pretend", "pytest>=3.0.1"],