build(deps): bump taskcluster from 38.0.4 to 38.0.6 in /tools (#666)

Bumps [taskcluster](https://github.com/taskcluster/taskcluster) from 38.0.4 to 38.0.6.
- [Release notes](https://github.com/taskcluster/taskcluster/releases)
- [Changelog](https://github.com/taskcluster/taskcluster/blob/main/CHANGELOG.md)
- [Commits](taskcluster/taskcluster@v38.0.4...v38.0.6)

Signed-off-by: dependabot[bot] <[email protected]>

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==38.0.4
+taskcluster==38.0.6