Pin dask/distributed versions for release

[charlesbluca]

Restricts the max version of dask/distributed to the latest stable release, in preparation for a new dask-sql release

[codecov-commenter]

Codecov Report

Merging #380 (c2054b1) into main (8a6302c) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #380   +/-   ##
=======================================
  Coverage   95.60%   95.60%           
=======================================
  Files          67       67           
  Lines        2933     2933           
  Branches      547      547           
=======================================
  Hits         2804     2804           
  Misses         79       79           
  Partials       50       50           

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