CONTRIBUTING.md: Fix typo

[cclauss]

Summary of Changes

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Related Issues

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[codecov[bot]]

Codecov Report

Merging #2091 (2824ce4) into master (5771bfc) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##            master     #2091   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           63        63           
  Lines         6752      6752           
  Branches      1254      1254           
=========================================
  Hits          6752      6752           

Impacted Files	Coverage Δ
falcon/util/sync.py	100.00% <ø> (ø)

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[CaselIT]

that fail on pep8 is not due to flake8 v5 that became better at finding errors, and is otherwise unrelated to this PR

[cclauss]

The flake8 error was a long line.

[CaselIT]

Thanks for fixing that!