chore(deps): bump ajv from 5.5.2 to 7.2.1

Bumps [ajv](https://github.com/ajv-validator/ajv) from 5.5.2 to 7.2.1.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v5.5.2...v7.2.1)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -57,7 +57,7 @@
     "watch": "webpack --config  webpack/core.babel.js --watch --progress"
   },
   "dependencies": {
-    "ajv": "^5.2.2",
+    "ajv": "^7.2.1",
     "ajv-errors": "^1.0.1",
     "ajv-keywords": "^3.4.0",
     "boron": "^0.2.3",