fix SSMS build (#1045)

Author: ErikEJ

src/GUI/SSMSToolbox/SSMSToolbox.csproj

@@ -58,7 +58,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>ErikEJ.SqlCeToolbox</RootNamespace>
     <AssemblyName>SSMSToolbox</AssemblyName>
-    <TargetFrameworkVersion>v4.7.2</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v4.8</TargetFrameworkVersion>
     <GeneratePkgDefFile>true</GeneratePkgDefFile>
     <IncludeAssemblyInVSIXContainer>true</IncludeAssemblyInVSIXContainer>
     <IncludeDebugSymbolsInVSIXContainer>true</IncludeDebugSymbolsInVSIXContainer>