build(deps): bump twisted from 20.3.0 to 21.2.0 in /testing/plugins_integration#18

dependabot[bot] wants to merge 1 commit intomastergraingert/pytest:masterfrom

dependabot/pip/testing/plugins_integration/twisted-21.2.0graingert/pytest:dependabot/pip/testing/plugins_integration/twisted-21.2.0Copy head branch name to clipboard