.pytool/UncrustifyCheck: Update to 73.0.8

Updates to the latest release.

- Includes a fix for preventing endless indentation in struct
  assignment.
- Include Windows Arm, Linux Arm, and Mac OS builds.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Michael Kubacki <mikuback@linux.microsoft.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Sean Brogan <sean.brogan@microsoft.com>

.pytool/Plugin/UncrustifyCheck/uncrustify_ext_dep.yaml

@@ -10,7 +10,7 @@
   "type": "nuget",
   "name": "mu-uncrustify-release",
   "source": "https://pkgs.dev.azure.com/projectmu/Uncrustify/_packaging/mu_uncrustify/nuget/v3/index.json",
-  "version": "73.0.3",
+  "version": "73.0.8",
   "flags": ["set_shell_var", "host_specific"],
   "var_name": "UNCRUSTIFY_CI_PATH"
 }