chore: Enable ISC Ruff checks

[edgarrmondragon]

Motivation for flake8-implicit-str-concat:

This is a plugin for the Python code-checking tool Flake8 to encourage correct string literal concatenation.

It looks for style problems like implicitly concatenated string literals on the same line (which can be introduced by the code-formatting tool Black), or unnecessary plus operators for explicit string literal concatenation.

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📚 Documentation preview 📚: https://meltano-sdk--1499.org.readthedocs.build/en/1499/

[WillDaSilva]

This is great!

[codecov]

Codecov Report

Merging #1499 (b79e9f6) into main (c328272) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main    #1499   +/-   ##
=======================================
  Coverage   85.50%   85.50%           
=======================================
  Files          57       57           
  Lines        4760     4760           
  Branches      813      813           
=======================================
  Hits         4070     4070           
  Misses        498      498           
  Partials      192      192           

Impacted Files	Coverage Δ
singer_sdk/_singerlib/catalog.py	98.17% <ø> (ø)
singer_sdk/_singerlib/messages.py	97.61% <ø> (ø)
singer_sdk/_singerlib/schema.py	100.00% <ø> (ø)
singer_sdk/authenticators.py	65.76% <ø> (ø)
singer_sdk/configuration/_dict_config.py	100.00% <ø> (ø)
singer_sdk/connectors/sql.py	81.91% <ø> (ø)
singer_sdk/helpers/_catalog.py	72.00% <ø> (ø)
singer_sdk/helpers/_conformers.py	78.57% <ø> (ø)
singer_sdk/helpers/_flattening.py	72.72% <ø> (ø)
singer_sdk/helpers/_state.py	69.44% <0.00%> (ø)
... and 21 more

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