Update mxgraph contains security vulnerability

https://app.snyk.io/test/npm/mxgraph/3.9.12

package.json

@@ -44,7 +44,7 @@
     "mediaelement": "^4.2.9",
     "moment": "^2.22",
     "multiselect-two-sides": "^2.5.5",
-    "mxgraph": "^3.9.3",
+    "mxgraph": "^4.0",
     "optimize-css-assets-webpack-plugin": "^5.0.1",
     "pace-js-amd-fix": "^1.0.5",
     "perfect-scrollbar": "^1.4.0",

yarn.lock

@@ -5161,10 +5161,10 @@ mv@^2.1.1:
     ncp "~2.0.0"
     rimraf "~2.4.0"
 
-mxgraph@^3.9.3:
-  version "3.9.12"
-  resolved "https://registry.yarnpkg.com/mxgraph/-/mxgraph-3.9.12.tgz#5a5f75a79ab7e934ab935ce6ccfa0cff5c0da948"
-  integrity sha512-fm15Ro1bc/d3T/qvrkOIPjdAgyaKuaE6+olMpu9QZOm3aHWimu+W+dGAusW8VGVmaF4VYII11a5sVNdLekRoEw==
+mxgraph@^4.0:
+  version "4.0.1"
+  resolved "https://registry.yarnpkg.com/mxgraph/-/mxgraph-4.0.1.tgz#fc81226cf3ee9953c0e695d1270c9866b91ef7a7"
+  integrity sha512-nCl0gGRzPumnbCJcGtI7GhnQggMueN+XLXTLNljphzwSHDfAOBDkY1TFuOoFtIEn7Pae2+f2a2D2r3UGi2CFLw==
 
 nan@^2.12.1, nan@^2.13.2:
   version "2.14.0"