Include SourceLink file in CoreCompile dependency checks

A companion to dotnet/msbuild#9743 to ensure that more sourcelink/determinism-related flags correctly cause the compiler to be invoked when they change

Author: baronfel

src/FSharp.Build/Microsoft.FSharp.Targets

@@ -275,7 +275,8 @@ this file.
                 $(VersionFile);
                 $(KeyOriginatorFile);
                 $(UseSource);
-                $(LoadSource)"
+                $(LoadSource);
+                $(SourceLink)"
         Outputs="@(DocFileItem);
                  @(IntermediateAssembly);
                  @(IntermediateRefAssembly);