Bump actions/checkout from 2.4.0 to 3#7

dependabot[bot] wants to merge 1 commit intoMasterwww-jrtorres042-github-enterprise-org/git_microsoft-powershell_achive-credential_shield_tracker_guide-covid-19_live-cam_opensource-diff-1:Masterfrom

dependabot-github_actions-actions-checkout-3www-jrtorres042-github-enterprise-org/git_microsoft-powershell_achive-credential_shield_tracker_guide-covid-19_live-cam_opensource-diff-1:dependabot-github_actions-actions-checkout-3Copy head branch name to clipboard