Use numbers module from stdlib as type

[basnijholt]

Description

Please include a summary of the change and which (if so) issue is fixed.

Fixes #(ISSUE_NUMBER_HERE)

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 #379 (0ae2912) into main (682a1f0) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #379      +/-   ##
==========================================
- Coverage   77.68%   77.67%   -0.02%     
==========================================
  Files          37       37              
  Lines        5414     5420       +6     
  Branches      982      982              
==========================================
+ Hits         4206     4210       +4     
- Misses       1062     1063       +1     
- Partials      146      147       +1     

Impacted Files	Coverage Δ
adaptive/learner/average_learner.py	79.33% <100.00%> (+0.34%)	⬆️
adaptive/learner/average_learner1D.py	74.08% <100.00%> (+0.08%)	⬆️
adaptive/learner/learner1D.py	87.22% <100.00%> (+0.06%)	⬆️
adaptive/learner/sequence_learner.py	76.10% <100.00%> (ø)
adaptive/types.py	100.00% <100.00%> (ø)
adaptive/runner.py	68.60% <0.00%> (-0.69%)	⬇️

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