Bump cryptography from 2.9.2 to 3.2.1 (#500)

Bumps [cryptography](https://github.com/pyca/cryptography) from 2.9.2 to 3.2.1.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst)
- [Commits](pyca/cryptography@2.9.2...3.2.1)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

setup.py

@@ -200,7 +200,7 @@ def _get_arrow_lib_as_linker_input(self):
         'pycryptodomex>=3.2,!=3.5.0,<4.0.0',
         'pyOpenSSL>=16.2.0,<21.0.0',
         'cffi>=1.9,<1.15',
-        'cryptography>=2.5.0,<3.0.0',
+        'cryptography>=2.5.0,<4.0.0',
         'pyjwt<2.0.0',
         'idna<2.11',
         'oscrypto<2.0.0',