Bump ajv from 7.1.1 to 7.2.1

Bumps [ajv](https://github.com/ajv-validator/ajv) from 7.1.1 to 7.2.1.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v7.1.1...v7.2.1)

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

package.json

@@ -53,7 +53,7 @@
     "dotenv": "^8.2.0"
   },
   "devDependencies": {
-    "ajv": "^7.0.3",
+    "ajv": "^7.2.1",
     "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
     "eslint": "^7.11.0",