build(deps): bump taskcluster from 38.0.6 to 39.0.0 in /tools (#691)

Bumps [taskcluster](https://github.com/taskcluster/taskcluster) from 38.0.6 to 39.0.0.
- [Release notes](https://github.com/taskcluster/taskcluster/releases)
- [Changelog](https://github.com/taskcluster/taskcluster/blob/main/CHANGELOG.md)
- [Commits](taskcluster/taskcluster@v38.0.6...v39.0.0)

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

Author: dependabot[bot]

tools/requirements.txt

@@ -3,4 +3,4 @@ async-timeout==3.0.1
 logbook==1.5.3
 raven==6.10.0
 structlog==20.1.0
-taskcluster==38.0.6
+taskcluster==39.0.0