chore(deps): bump cryptography in /samples/api-client/manager (#410)

Bumps [cryptography](https://github.com/pyca/cryptography) from 38.0.1 to 38.0.3.
- [Release notes](https://github.com/pyca/cryptography/releases)
- [Changelog](https://github.com/pyca/cryptography/blob/main/CHANGELOG.rst)
- [Commits](pyca/cryptography@38.0.1...38.0.3)

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

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Signed-off-by: dependabot[bot] <support@github.com>
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Co-authored-by: Anthonios Partheniou <partheniou@google.com>

Author: dependabot[bot]

samples/api-client/manager/requirements.txt

@@ -1,4 +1,4 @@
-cryptography==38.0.1
+cryptography==38.0.3
 flaky==3.7.0
 google-api-python-client==2.65.0
 google-auth-httplib2==0.1.0