Fix build issue in policy/gui

policy/gui is reporting that it can't find the dependency
babel/traverse.

Issue-ID: POLICY-4333
Change-Id: I99bbc5d30a13c76672728f169255f1d89c398541
Signed-off-by: liamfallon <liam.fallon@est.tech>
diff --git a/gui-editors/gui-editor-apex/src/main/webapp/package.json b/gui-editors/gui-editor-apex/src/main/webapp/package.json
index f581ae2..6acfafe 100644
--- a/gui-editors/gui-editor-apex/src/main/webapp/package.json
+++ b/gui-editors/gui-editor-apex/src/main/webapp/package.json
@@ -13,6 +13,7 @@
     "@babel/cli": "^7.10.5",
     "@babel/core": "^7.11.4",
     "@babel/preset-env": "^7.11.0",
+    "@babel/traverse": "^7.19.0",
     "babel-jest": "^26.3.0",
     "babel-loader": "^8.1.0",
     "jest": "^26.4.2",