build(deps): bump certifi

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] <support@github.com>

synthtool/gcp/templates/java_library/.kokoro/requirements.in

@@ -17,7 +17,7 @@ pycparser==2.21
 pyperclip==1.8.2
 python-dateutil==2.8.2
 requests==2.27.1
-certifi==2022.9.24
+certifi==2022.12.7
 importlib-metadata==4.8.3
 zipp==3.6.0
 google_api_core==2.8.2

synthtool/gcp/templates/java_library/.kokoro/requirements.txt

@@ -16,9 +16,9 @@ cachetools==4.2.4 \
     # via
     #   -r requirements.in
     #   google-auth
-certifi==2022.9.24 \
-    --hash=sha256:0d9c601124e5a6ba9712dbc60d9c53c21e34f5f641fe83002317394311bdce14 \
-    --hash=sha256:90c1a32f1d68f940488354e36370f6cca89f0f106db09518524c88d6ed83f382
+certifi==2022.12.7 \
+    --hash=sha256:35824b4c3a97115964b408844d64aa14db1cc518f6562e8d7261699d1350a9e3 \
+    --hash=sha256:4ad3232f5e926d6718ec31cfc1fcadfde020920e278684144551c91769c7bc18
     # via
     #   -r requirements.in
     #   requests