Update file(s) from "wp-cli/.github"

Update package requirements

Tests: improve Windows compatibility (#100)

Tests: Use different port numbers between scenarios (#99)

Add .gitattributes file

See wp-cli/wp-cli#5070

Update file(s) from wp-cli/.github

Merge pull request #85 from wp-cli/refine-feature-files

Fix docstring indent issue in feature files

Merge pull request #83 from wp-cli/no-lock-file

Update to WPCS v3 (#80)

* Update to wp-cli-tests v4 (which requires WPCS v3)

* Fix all autofixable CS issues

* Rename parameter

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Co-authored-by: Pascal Birchler <pascalb@google.com>

Add `composer phpcbf` and allow `wordpress-core-installer` (#79)