Bump cryptography from 3.4.7 to 3.4.8

Bumps [cryptography](https://github.com/pyca/cryptography) from 3.4.7 to 3.4.8.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pyca/cryptography/compare/3.4.7...3.4.8)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements/dev.txt

@@ -26,7 +26,7 @@ charset-normalizer==2.0.4
     # via requests
 click==8.0.1
     # via pip-tools
-cryptography==3.4.7
+cryptography==3.4.8
     # via -r requirements/typing.in
 distlib==0.3.2
     # via virtualenv

requirements/typing.txt

@@ -6,7 +6,7 @@
 #
 cffi==1.14.6
     # via cryptography
-cryptography==3.4.7
+cryptography==3.4.8
     # via -r requirements/typing.in
 mypy==0.910
     # via -r requirements/typing.in