Bump WinForms to 3.0.3

Author: Deadpikle

src/NetSparkle.UI.WinForms.NetFramework/NetSparkle.UI.WinForms.NetFramework.csproj

@@ -8,7 +8,7 @@
     <UseWindowsForms>true</UseWindowsForms>
     <ImportWindowsDesktopTargets>true</ImportWindowsDesktopTargets>
 	<Nullable>Enable</Nullable>
-	<Version>3.0.3-previewTEST-001</Version>
+	<Version>3.0.3</Version>
 	<LangVersion>8.0</LangVersion>
 	<PackageLicenseExpression>MIT</PackageLicenseExpression>
 	<PackageReadmeFile>README.md</PackageReadmeFile>