build(deps): bump cryptography from 2.9.2 to 3.2 in /demo_proj

Bumps [cryptography](https://github.com/pyca/cryptography) from 2.9.2 to 3.2.
- [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)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

demo_proj/requirements.txt

@@ -2,7 +2,7 @@ attrs==19.3.0
 Automat==20.2.0
 cffi==1.14.0
 constantly==15.1.0
-cryptography==2.9.2
+cryptography==3.2
 cssselect==1.1.0
 Django==2.2.13
 django-cors-headers==3.3.0