chore(deps): bump certifi in /samples/snippets (#885)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2023.5.7 to 2023.7.22.
- [Commits](certifi/python-certifi@2023.05.07...2023.07.22)

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

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Author: dependabot[bot]

samples/snippets/requirements.txt

@@ -1,5 +1,5 @@
 alembic==1.11.1
-certifi==2023.5.7
+certifi==2023.7.22
 charset-normalizer==3.2.0
 geoalchemy2==0.14.0
 google-api-core[grpc]==2.11.1