Port "externals: Update catch to 2.3.0" from yuzu (#4060)

* externals: Update catch to 2.3.0

Updates the library from 2.2.3 to 2.3.0

* fix catch2/catch.hpp includes

src/tests/core/memory/memory.cpp

@@ -2,7 +2,7 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <catch.hpp>
+#include <catch2/catch.hpp>
 #include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/process.h"
 #include "core/memory.h"

src/tests/core/memory/vm_manager.cpp

@@ -3,7 +3,7 @@
 // Refer to the license.txt file included.
 
 #include <vector>
-#include <catch.hpp>
+#include <catch2/catch.hpp>
 #include "core/hle/kernel/errors.h"
 #include "core/hle/kernel/memory.h"
 #include "core/hle/kernel/vm_manager.h"