update Bullseye to 3.0.0-rc.1 (#4081)

(cherry picked from commit dfb5452)

Author: russcam

build/scripts/scripts.fsproj

@@ -66,7 +66,7 @@
     <FscToolExe>fsharpc</FscToolExe>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Bullseye" Version="2.4.0-rc.2" />
+    <PackageReference Include="Bullseye" Version="3.0.0-rc.1" />
     <PackageReference Include="Elastic.Managed" Version="0.1.0-ci20190627T121416" />
     <PackageReference Include="Fake.Core.Environment" Version="5.15.0" />
     <PackageReference Include="Fake.Core.SemVer" Version="5.15.0" />