Bump Polyfill from 8.7.1 to 8.7.3#310

SimonCropp merged 1 commit intomainVerifyTests/Verify.SystemJson:mainfrom

dependabot/nuget/src/Polyfill-8.7.3VerifyTests/Verify.SystemJson:dependabot/nuget/src/Polyfill-8.7.3Copy head branch name to clipboard