Bump Polyfill from 9.6.0 to 9.7.3#900

dependabot[bot] wants to merge 1 commit intomaintinglesoftware/eventbus:mainfrom

dependabot/nuget/src/Polyfill-9.7.3tinglesoftware/eventbus:dependabot/nuget/src/Polyfill-9.7.3Copy head branch name to clipboard