Dependencies are overridden by packaging projects and might not align #15398

Testhost has binding redirects for libraries (like system.collections.immutable) that we need to regularly update, but the project itself does not reference them.
The shipped testhost then can have mismatched dlls, and binding redirects, as we see highlighted here: #15397

Better approach would be to reference the updated dependecies from testhost (and other places directy) so the udpated dlls end up in its bin folder.

(and even more ideal if we generated the packages automatically based on the deps, but that does not work for tools packages).