[GTK4] Fix Webkit loading

Adjust dlopened webkitgtk lib to the stable one as
libwebkit2gtk-5.0.so.0 used till now is obsolete now.

Author: akurtakov

bundles/org.eclipse.swt/Eclipse SWT WebKit/gtk/library/webkitgtk.h

@@ -43,7 +43,7 @@
 		void* handle = 0; \
 		char *gtk4 = getenv("SWT_GTK4"); \
 		if (gtk4 != NULL && strcmp(gtk4, "1") == 0) { \
-			handle = dlopen("libwebkit2gtk-5.0.so.0", LOAD_FLAGS); \
+			handle = dlopen("libwebkitgtk-6.0.so.4", LOAD_FLAGS); \
 		} else { \
 			handle = dlopen("libwebkit2gtk-4.1.so.0", LOAD_FLAGS); /* webkit2/libsoup3 */ \
 			if (!handle) { \