Bump Polyfill from 9.11.0 to 9.12.0#368

dependabot[bot] wants to merge 1 commit intomainVerifyTests/Verify.MailMessage:mainfrom

dependabot/nuget/src/Polyfill-9.12.0VerifyTests/Verify.MailMessage:dependabot/nuget/src/Polyfill-9.12.0Copy head branch name to clipboard