Bump to mono/debugger-libs@d5664344 (#9238)

Changes: mono/debugger-libs@84c5c67...d566434
Context: #9237

Updating this submodule in main, to align with changes on the
`release/9.0.1xx-rc1` branch.

Notably, this sets `$(DisableTransitiveFrameworkReferenceDownloads)`
for mono/debugger-libs to avoid restoring ASP.NET and Windows desktop
packages for downlevel .NET versions.

Changes in mono/debugger-libs:

* Fix Policheck errors

* Adding AddExplicitInterfaceImplementation

* Fix add breakpoint and viewing locals from a pdb loaded on debugges

* Synchronize access to symbols dictionary

* [build] add extension point for consuming repositories

Author: jonathanpeppers

external/debugger-libs

@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <!-- Disables the transitive restore of packages like Microsoft.AspNetCore.App.Ref, Microsoft.WindowsDesktop.App.Ref -->
+    <DisableTransitiveFrameworkReferenceDownloads>true</DisableTransitiveFrameworkReferenceDownloads>
+  </PropertyGroup>
+</Project>