Bump cryptography from 2.8 to 41.0.3 in /webapp-v3

Bumps [cryptography](https://github.com/pyca/cryptography) from 2.8 to 41.0.3.
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@2.8...41.0.3)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: direct:production
...

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

Author: dependabot[bot]

webapp-v3/requirements.txt

@@ -4,7 +4,7 @@ certifi==2019.9.11
 cffi==1.13.2
 chardet==3.0.4
 click==7.0
-cryptography==2.8
+cryptography==41.0.3
 flask-bcrypt==0.7.1
 flask-cache==0.13.1
 flask-caching==1.7.2