Bump ajv from 6.12.5 to 6.12.6

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.12.5 to 6.12.6.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](https://github.com/ajv-validator/ajv/compare/v6.12.5...v6.12.6)

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

package-lock.json

@@ -1368,9 +1368,9 @@
       "dev": true
     },
     "ajv": {
-      "version": "6.12.5",
-      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.5.tgz",
-      "integrity": "sha512-lRF8RORchjpKG50/WFf8xmg7sgCLFiYNNnqdKflk63whMQcWR5ngGjiSXkL9bjxy6B2npOK2HSMN49jEBMSkag==",
+      "version": "6.12.6",
+      "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.12.6.tgz",
+      "integrity": "sha512-j3fVLgvTo527anyYyJOGTYJbG+vnnQYvE0m5mmkc1TK+nxAppkCLMIL0aZ4dblVCNoGShhm+kzE4ZUykBoMg4g==",
       "requires": {
         "fast-deep-equal": "^3.1.1",
         "fast-json-stable-stringify": "^2.0.0",