Switch from Tox to Nox

[basnijholt]

Description

Switch from Tox to Nox to simplify configuration.

Checklist

• Fixed style issues using pre-commit run --all (first install using pip install pre-commit)
• pytest passed

Type of change

Check relevant option(s).

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• (Code) style fix or documentation update
• This change requires a documentation update

[codecov-commenter]

Codecov Report

Merging #347 (60eae70) into master (d1b0b2a) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #347      +/-   ##
==========================================
+ Coverage   80.70%   80.81%   +0.11%     
==========================================
  Files          38       38              
  Lines        5073     5057      -16     
  Branches      946      946              
==========================================
- Hits         4094     4087       -7     
+ Misses        837      828       -9     
  Partials      142      142              

Impacted Files	Coverage Δ
adaptive/learner/base_learner.py	90.24% <ø> (+6.15%)	⬆️
adaptive/runner.py	70.10% <ø> (-0.22%)	⬇️
adaptive/learner/average_learner.py	86.86% <100.00%> (-0.27%)	⬇️
adaptive/learner/average_learner1D.py	79.55% <100.00%> (+0.66%)	⬆️
adaptive/learner/learner1D.py	90.50% <100.00%> (+0.06%)	⬆️
adaptive/tests/algorithm_4.py	71.17% <0.00%> (ø)
... and 1 more

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