docs: Remove requests install from JupyterLite REPL setup

[matthewfeickert]

Description

Given the async nature of the Pyodide kernel #1775 (comment) requests isn't something we can usefully use for pyhf.contrib.utils.download in Pyodide examples. Given this, to simplify things as much as possible remove the install of requests from the setup of the JupyterLite REPL for the docs.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* To simplify things, remove the piplite install of requests from the JupyterLite REPL setup.
   - Given the async nature of Pyodide, requests isn't currently useful for examples using
     pyhf.contrib.utils.download. c.f. Issue #1775 for context.

[matthewfeickert]

Relevant RTD build: https://pyhf--2020.org.readthedocs.build/en/2020/#try-out-now-with-jupyterlite

[matthewfeickert]

The CI requires PR #2019 to go in first — c.f. #2019 (comment).

[codecov]

Codecov Report

Base: 98.29% // Head: 98.29% // No change to project coverage 👍

Coverage data is based on head (de416d5) compared to base (de416d5).
Patch has no changes to coverable lines.

❗ Current head de416d5 differs from pull request most recent head d95357e. Consider uploading reports for the commit d95357e to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2020   +/-   ##
=======================================
  Coverage   98.29%   98.29%           
=======================================
  Files          69       69           
  Lines        4529     4529           
  Branches      738      738           
=======================================
  Hits         4452     4452           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	27.51% <0.00%> (ø)
doctest	61.13% <0.00%> (ø)
unittests-3.10	96.31% <0.00%> (ø)
unittests-3.7	96.28% <0.00%> (ø)
unittests-3.8	96.33% <0.00%> (ø)
unittests-3.9	96.35% <0.00%> (ø)

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