externals: Bump dynarmic to 6.4.0

Uses the tagged, versioned release instead.

CMakeLists.txt

@@ -214,7 +214,7 @@ if (ARCHITECTURE_x86 OR ARCHITECTURE_x86_64)
 endif()
 
 if (ARCHITECTURE_x86_64 OR ARCHITECTURE_arm64)
-    find_package(dynarmic 6.2.4)
+    find_package(dynarmic 6.4.0)
 endif()
 
 if (ENABLE_CUBEB)

externals/dynarmic

@@ -1 +1 @@
-Subproject commit a76a2fff534b5584c9921bc5c060e910e95b7738
+Subproject commit bd570e093ca1d1206961296b90df65cda7de8e87