Bump cachetools from 5.2.0 to 5.2.1 in /tests (#3414)

Bumps [cachetools](https://github.com/tkem/cachetools) from 5.2.0 to 5.2.1.
- [Release notes](https://github.com/tkem/cachetools/releases)
- [Changelog](https://github.com/tkem/cachetools/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/tkem/cachetools/commits)

---
updated-dependencies:
- dependency-name: cachetools
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/requirements.txt

@@ -10,9 +10,9 @@ attrs==22.2.0 \
     # via
     #   -r requirements.txt
     #   pytest
-cachetools==5.2.0 \
-    --hash=sha256:6a94c6402995a99c3970cc7e4884bb60b4a8639938157eeed436098bf9831757 \
-    --hash=sha256:f9f17d2aec496a9aa6b76f53e3b614c965223c061982d434d160f930c698a9db
+cachetools==5.2.1 \
+    --hash=sha256:5991bc0e08a1319bb618d3195ca5b6bc76646a49c21d55962977197b301cc1fe \
+    --hash=sha256:8462eebf3a6c15d25430a8c27c56ac61340b2ecf60c9ce57afc2b97e450e47da
     # via
     #   -r requirements.txt
     #   google-auth