pip prod(deps): update distributed requirement from <2021.9 to <2021.10

Updates the requirements on [distributed](https://github.com/dask/distributed) to permit the latest version.
- [Release notes](https://github.com/dask/distributed/releases)
- [Changelog](https://github.com/dask/distributed/blob/main/docs/release-procedure.md)
- [Commits](dask/distributed@1.1.0...2021.09.0)

---
updated-dependencies:
- dependency-name: distributed
  dependency-type: direct:production
...

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

requirements.txt

@@ -14,7 +14,7 @@ codecov
 multidict
 anytree>=2.4.3
 pyrevolve>=2.1.3
-distributed<2021.9
+distributed<2021.10
 pytest>=3.6,<7.0
 pytest-runner
 pytest-cov