chore(deps): bump requests from 2.27.1 to 2.31.0 in /.kokoro

Bumps [requests](https://github.com/psf/requests) from 2.27.1 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.27.1...v2.31.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

.kokoro/requirements.in

@@ -16,7 +16,7 @@ pyparsing==3.0.9
 pycparser==2.21
 pyperclip==1.8.2
 python-dateutil==2.8.2
-requests==2.27.1
+requests==2.31.0
 certifi==2022.9.24
 importlib-metadata==4.8.3
 zipp==3.6.0

.kokoro/requirements.txt

@@ -411,9 +411,9 @@ python-dateutil==2.8.2 \
     # via
     #   -r requirements.in
     #   gcp-releasetool
-requests==2.27.1 \
-    --hash=sha256:68d7c56fd5a8999887728ef304a6d12edc7be74f1cfa47714fc8b414525c9a61 \
-    --hash=sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d
+requests==2.31.0 \
+    --hash=sha256:58cd2187c01e70e6e26505bca751777aa9f2ee0b7f4300988b709f44e013003f \
+    --hash=sha256:942c5a758f98d790eaed1a29cb6eefc7ffb0d1cf7af05c3d2791656dbd6ad1e1
     # via
     #   -r requirements.in
     #   gcp-releasetool