Try increasing the integration tests timeout to 25 minutes to see if it gets the macOS CI runs completing

Author: Numpsy

src/test/Fake.Core.IntegrationTests/Main.fs

@@ -8,7 +8,7 @@ open System
 
 [<EntryPoint>]
 let main argv =
-    let config = defaultConfig |> ExpectoHelpers.addTimeout (TimeSpan.FromMinutes(20.))
+    let config = defaultConfig |> ExpectoHelpers.addTimeout (TimeSpan.FromMinutes(25.))
 
     Tests.runTestsInAssembly
         { config with