Fix `np.bool_` and fix aminoacids download link

[yngvem]

Closes #18 and closes #19.

• Updates the bootstrap doctest for numpy 1.24.1
• Uses np.bool_ if available instead of np.bool
• Fixes broken link to the Aminoacids dataset

[codecov-commenter]

Codecov Report

Merging #20 (25b1d32) into main (4d8381f) will decrease coverage by 0.10%. The diff coverage is 85.71%.

@@            Coverage Diff             @@
##             main      #20      +/-   ##
==========================================
- Coverage   95.15%   95.04%   -0.11%     
==========================================
  Files          13       13              
  Lines        1464     1472       +8     
==========================================
+ Hits         1393     1399       +6     
- Misses         71       73       +2     

Impacted Files	Coverage Δ
tlviz/outliers.py	89.83% <ø> (ø)
tlviz/visualisation.py	96.89% <60.00%> (-0.54%)	:arrow_down:
tlviz/data.py	61.53% <100.00%> (+1.53%)	:arrow_up:

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