Improve string formatting syntax

[jwodder]

Part of #325.

[codecov-commenter]

Codecov Report

Merging #364 (e3616fb) into master (078b7c9) will increase coverage by 0.01%.
The diff coverage is 20.45%.

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@@            Coverage Diff             @@
##           master     #364      +/-   ##
==========================================
+ Coverage   33.63%   33.65%   +0.01%     
==========================================
  Files          51       51              
  Lines        7034     7030       -4     
  Branches     1784     1784              
==========================================
  Hits         2366     2366              
+ Misses       4489     4485       -4     
  Partials      179      179              

Impacted Files	Coverage Δ
src/nidm/core/dot.py	11.45% <0.00%> (+0.17%)	⬆️
src/nidm/core/serializers/__init__.py	0.00% <0.00%> (ø)
src/nidm/core/serializers/provonerdf.py	0.00% <0.00%> (ø)
src/nidm/experiment/Core.py	51.28% <0.00%> (ø)
src/nidm/experiment/Navigate.py	84.05% <0.00%> (ø)
src/nidm/experiment/Session.py	75.00% <ø> (ø)
src/nidm/experiment/tools/bidsmri2nidm.py	0.00% <0.00%> (ø)
src/nidm/experiment/tools/csv2nidm.py	0.00% <0.00%> (ø)
src/nidm/experiment/tools/nidm2bids.py	0.00% <0.00%> (ø)
...nidm/experiment/tools/nidm_affinity_propagation.py	0.00% <0.00%> (ø)
... and 9 more

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[yarikoptic]

Looks LGTM, thank you @jwodder !

[github-actions]

🚀 PR was released in v4.0.0 🚀