chore(deps-dev): bump validator from 13.12.0 to 13.15.20 in /hello-world-office-addin#1500

dependabot[bot] wants to merge 1 commit intodevOfficeDev/microsoft-365-agents-toolkit-samples:devfrom

dependabot/npm_and_yarn/hello-world-office-addin/validator-13.15.20OfficeDev/microsoft-365-agents-toolkit-samples:dependabot/npm_and_yarn/hello-world-office-addin/validator-13.15.20Copy head branch name to clipboard