Merge pull request #2787 from Unidata/dependabot-pip-ci-flake8-requirements-1.7.4

CI: (deps): Bump flake8-requirements from 1.7.3 to 1.7.4 in /ci

Author: dopplershift

ci/linting_requirements.txt

@@ -13,7 +13,7 @@ flake8-mutable==1.2.0
 flake8-pie==0.16.0
 flake8-print==5.0.0
 flake8-quotes==3.3.1
-flake8-requirements==1.7.3
+flake8-requirements==1.7.4
 flake8-simplify==0.19.3
 pep8-naming==0.13.2