Bump taskcluster from 99.1.0 to 99.2.1 in /tools

Bumps [taskcluster](https://github.com/taskcluster/taskcluster) from 99.1.0 to 99.2.1.
- [Release notes](https://github.com/taskcluster/taskcluster/releases)
- [Changelog](https://github.com/taskcluster/taskcluster/blob/main/CHANGELOG.md)
- [Commits](taskcluster/taskcluster@v99.1.0...v99.2.1)

---
updated-dependencies:
- dependency-name: taskcluster
  dependency-version: 99.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

tools/ci/requirements_tc.txt

@@ -3,4 +3,4 @@ pyyaml==6.0.1
 types-pyyaml==6.0.12.20241230
 requests==2.32.3
 types-requests==2.32.0.20241016
-taskcluster==99.1.0
+taskcluster==99.2.1

tools/requirements_tests.txt

@@ -4,6 +4,6 @@ jsonschema==4.25.1; python_version >= '3.9'
 jsonschema==4.23.0; python_version < '3.9'
 pyyaml==6.0.1
 types-pyyaml==6.0.12.20241230
-taskcluster==99.1.0
+taskcluster==99.2.1
 mozfile==3.0.0
 mozterm==1.0.0