Rename 'pytables' to 'tables' in pyproject.toml

[w-k-jones]

Rename pytables requirement to tables to match pypi listing. Resolves #570

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.54%. Comparing base (21a474e) to head (23e5eb7).

Additional details and impacted files

@@            Coverage Diff             @@
##           RC_v1.6.x     #583   +/-   ##
==========================================
  Coverage      65.54%   65.54%           
==========================================
  Files             28       28           
  Lines           4188     4188           
==========================================
  Hits            2745     2745           
  Misses          1443     1443           

Flag	Coverage Δ
unittests	65.54% <ø> (ø)

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[github-actions]

Linting results by Pylint:

Your code has been rated at 8.36/10 (previous run: 8.38/10, -0.02)
_{The linting score is an indicator that reflects how well your code version follows Pylint’s coding standards and quality metrics with respect to the RC_v1.6.x branch.
A decrease usually indicates your new code does not fully meet style guidelines or has potential errors.}