🐛 FIX: floor table column widths to integers

[jeanas]

Don't use floats, since some Sphinx builders expect the widths to be
integers, like the Texinfo builder and the text builder.

Closes #540

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[codecov]

Codecov Report

Merging #568 (b575490) into master (602470e) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #568   +/-   ##
=======================================
  Coverage   89.83%   89.83%           
=======================================
  Files          20       20           
  Lines        2116     2116           
=======================================
  Hits         1901     1901           
  Misses        215      215           

Flag	Coverage Δ
pytests	89.83% <100.00%> (ø)

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Impacted Files	Coverage Δ
myst_parser/mdit_to_docutils/base.py	92.26% <100.00%> (ø)

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[chrisjsewell]

Great cheers!

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