Bump cryptography from 3.2 to 39.0.1 in /examples/yoti_example_flask

Bumps [cryptography](https://github.com/pyca/cryptography) from 3.2 to 39.0.1.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@3.2...39.0.1)

---
updated-dependencies:
- dependency-name: cryptography
  dependency-type: indirect
...

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

examples/yoti_example_flask/requirements.txt

@@ -18,7 +18,7 @@ click==8.1.2
     # via
     #   -r requirements.in
     #   flask
-cryptography==3.2
+cryptography==39.0.1
     # via
     #   pyopenssl
     #   yoti
@@ -59,7 +59,6 @@ requests==2.21.0
 six==1.16.0
     # via
     #   -r requirements.in
-    #   cryptography
     #   protobuf
     #   pyopenssl
 urllib3==1.24.2