Stop pinning pip, setuptools, and wheel in github workflow

[eapolinario]

Signed-off-by: Eduardo Apolinario [email protected]

TL;DR

This is just some cleanup work. A followup to #641

Type

• Bug Fix
• Feature
• Plugin

Are all requirements met?

• Code completed
• Smoke tested
• Unit tests added
• Code documentation added
• Any pending items have an associated Issue

Complete description

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

https://github.com/lyft/flyte/issues/

Follow-up issue

NA
OR
https://github.com/lyft/flyte/issues/

[codecov]

Codecov Report

Merging #664 (cc4a9bf) into master (d04e9f6) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #664   +/-   ##
=======================================
  Coverage   85.57%   85.57%           
=======================================
  Files         355      355           
  Lines       29340    29340           
  Branches     2379     2379           
=======================================
  Hits        25109    25109           
  Misses       3594     3594           
  Partials      637      637           

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