Bump taskcluster from 16.0.0 to 16.2.0 (#900)

Bump [taskcluster](https://github.com/taskcluster/taskcluster) from 16.0.0 to 16.2.0.
- [Release notes](https://github.com/taskcluster/taskcluster/releases)
- [Changelog](https://github.com/taskcluster/taskcluster/blob/master/CHANGELOG.md)
- [Commits](https://github.com/taskcluster/taskcluster/compare/v16.0.0...v16.2.0)

infra/spawn_pipeline_requirements.txt

@@ -1,4 +1,4 @@
-taskcluster==16.0.0
+taskcluster==16.2.0
 json-e==3.0.0
 requests==2.22.0
 pyyaml==5.1.2

requirements.txt

@@ -13,7 +13,7 @@ rs_parsepatch==0.2.2
 tqdm==4.34.0
 python-dateutil==2.8.0
 zstandard==0.11.1
-taskcluster==16.0.0
+taskcluster==16.2.0
 microannotate==0.0.11
 tabulate==0.8.3
 pydriller==1.9.2