Bump cryptography from 3.4.8 to 35.0.0 in /Backend

Bumps [cryptography](https://github.com/pyca/cryptography) from 3.4.8 to 35.0.0.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@3.4.8...35.0.0)

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

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

Backend/requirements.txt

@@ -6,6 +6,6 @@ pyodbc==4.0.30
 requests==2.26.0
 uuid==1.30
 mysql-connector-python==8.0.27
-cryptography==3.4.8
+cryptography==35.0.0
 pycryptodome==3.11.0
 Wand==0.6.6