Bump dask from 1.1.4 to 2021.10.0

Bumps [dask](https://github.com/dask/dask) from 1.1.4 to 2021.10.0.
- [Release notes](https://github.com/dask/dask/releases)
- [Changelog](https://github.com/dask/dask/blob/main/docs/release-procedure.md)
- [Commits](https://github.com/dask/dask/compare/1.1.4...2021.10.0)

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

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

requirements.txt

@@ -1,6 +1,6 @@
 numpy
 pandas
-dask==1.1.4
+dask==2021.10.0
 pyarrow==0.12.1
 tqdm
 pytorch-pretrained-bert==0.6.2