build(deps): bump certifi from 2022.9.24 to 2022.12.7 in /gax-java/.kokoro (#1152)

Bumps [certifi](https://togithub.com/certifi/python-certifi) from 2022.9.24 to 2022.12.7.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://togithub.com/certifi/python-certifi/commit/9e9e840925d7b8e76c76fdac1fab7e6e88c1c3b8"><code>9e9e840</code></a> 2022.12.07</li>
<li>See full diff in <a href="https://togithub.com/certifi/python-certifi/compare/2022.09.24...2022.12.07">compare view</a></li>
</ul>
</details>
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Author: dependabot[bot]

gax-java/.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

gax-java/.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