Bump y18n from 4.0.0 to 4.0.3 in /src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack#31

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dependabot/npm_and_yarn/src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/y18n-4.0.3tk24/JavaScriptServices:dependabot/npm_and_yarn/src/Microsoft.AspNetCore.SpaServices/npm/aspnet-webpack/y18n-4.0.3Copy head branch name to clipboard