Updated Project sample with .Net 9 version.#2

VimalaThirumalaikumar merged 2 commits intomasterSyncfusionExamples/How-to-create-a-dotted-line-chart-in-.NET-MAUI-Chart:masterfrom

DottedLinechartSampleSyncfusionExamples/How-to-create-a-dotted-line-chart-in-.NET-MAUI-Chart:DottedLinechartSampleCopy head branch name to clipboard