Update React to v18

Update migration guide to mention react resolutions from package.json


Contributed on behalf of STMicroelectronics
Signed-off-by: Alexandra Buzila <abuzila@eclipsesource.com>

doc/Migration.md

@@ -29,6 +29,16 @@ The `react` and `react-dom` dependencies were upgraded to version 18. Some relev
  - the new API no longer supports render callbacks
  - updates in promises, setTimeout, event handlers are automatically batched
 
+ Because the currently used version of `react-virtualized` still depends on React 16, a `resolutions` block is needed in the `package.json` for the React 18 dependencies:
+
+ ```json
+"resolutions": {
+    "@types/react": "18.0.15",
+    "@types/react-dom": "18.0.6"
+    ...
+  }
+ ```
+
 ### v1.24.0
 
 #### node-gyp 8.4.1