update Bullseye to 3.0.0 (#4131)

(cherry picked from commit aea44a3)

Author: adamralph

build/scripts/scripts.fsproj

@@ -28,7 +28,7 @@
     <Content Include="..\..\build.bat"><Link>build.bat</Link></Content>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Bullseye" Version="3.0.0-rc.1" />
+    <PackageReference Include="Bullseye" Version="3.0.0" />
     <PackageReference Include="Elastic.Managed" Version="0.1.0-ci20190927T121631" />
     <PackageReference Include="Fake.Core.Environment" Version="5.15.0" />
     <PackageReference Include="Fake.Core.SemVer" Version="5.15.0" />