build: Set lower bound of scipy v1.1.0

[matthewfeickert]

Description

With tensorflow now v2.3+ given PR #1657, the scipy requirement of v1.4.1 has been lifted (c.f. PR #1001) as SciPy was removed as a TensorFlow dependency in tensorflow v2.3.1. This lifts the requirements on SciPy, and the oldest version that still has Python 3.7 wheels is scipy v1.1.0.

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• Tests are passing
• "WIP" removed from the title of the pull request
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* Set the lower bound of the supported SciPy versions to scipy v1.1.0
   - scipy v1.1.0 is the oldest SciPy release with Python 3.7 wheels

[codecov]

Codecov Report

Merging #1661 (16867d4) into master (f5dab71) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1661   +/-   ##
=======================================
  Coverage   98.07%   98.07%           
=======================================
  Files          64       64           
  Lines        4216     4216           
  Branches      585      585           
=======================================
  Hits         4135     4135           
  Misses         48       48           
  Partials       33       33           

Flag	Coverage Δ
contrib	25.30% <ø> (ø)
doctest	61.05% <ø> (ø)
unittests	96.39% <ø> (ø)

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