FsLint.Console: change RollForward to LatestMajor

It looks like the current roll foward behaviour was added for
built with is available.

Changing this to LatestMajor, however, would make it just use
the latest all the time (so for example, if you have both .NET6
and .NET8 installed, then it will use .NET8 all the time).

Fixes #687

Author: Numpsy

src/FSharpLint.Console/FSharpLint.Console.fsproj

@@ -12,7 +12,7 @@
     <AssemblyName>dotnet-fsharplint</AssemblyName>
     <RootNamespace>FSharpLint.Console</RootNamespace>
     <IsPackable>true</IsPackable>
-    <RollForward>Major</RollForward>
+    <RollForward>LatestMajor</RollForward>
   </PropertyGroup>
 
   <ItemGroup>