Update click version requirement in setup.cfg to match that in requirements.txt

[barrywhart]

Brief summary of the change made

Fixes #2519

Address the Megalinter issue discussed here: https://sqlfluff.slack.com/archives/C01GX4L213J/p1643566502596369. The issue was, the required version of click needed to be newer in order to ensure that the click.shell_completion module was present.

Are there any other side effects of this change that we should be aware of?

Pull Request checklist

• Please confirm you have completed any of the necessary steps below.

• Included test cases to demonstrate any code changes, which may be one or more of the following:

  • .yml rule test cases in test/fixtures/rules/std_rule_cases.
  • .sql/.yml parser test cases in test/fixtures/dialects (note YML files can be auto generated with tox -e generate-fixture-yml).
  • Full autofix test cases in test/fixtures/linter/autofix.
  • Other.

• Added appropriate documentation for the change.

• Created GitHub issues for any relevant followup/future enhancements if appropriate.

[codecov]

Codecov Report

Merging #2518 (99e1209) into main (4c95ee5) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##              main     #2518   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          162       162           
  Lines        11696     11696           
=========================================
  Hits         11696     11696           

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