Bump certifi in /docs/examples/cloud_trace_exporter (#224)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2022.9.24 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2022.09.24...2022.12.07)

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

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/examples/cloud_trace_exporter/requirements.txt

@@ -1,5 +1,5 @@
 cachetools==5.2.0
-certifi==2022.9.24
+certifi==2022.12.7
 charset-normalizer==2.1.1
 Deprecated==1.2.13
 google-api-core==2.10.2