Bump ajv and openapi-to-postmanv2

Bumps [ajv](https://github.com/ajv-validator/ajv) to 8.18.0 and updates ancestor dependencies [ajv](https://github.com/ajv-validator/ajv) and [openapi-to-postmanv2](https://github.com/postmanlabs/openapi-to-postman). These dependencies need to be updated together.


Updates `ajv` from 8.17.1 to 8.18.0
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v8.17.1...v8.18.0)

Updates `ajv` from 6.12.6 to 6.14.0
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v8.17.1...v8.18.0)

Updates `openapi-to-postmanv2` from 4.25.0 to 6.0.0
- [Release notes](https://github.com/postmanlabs/openapi-to-postman/releases)
- [Changelog](https://github.com/postmanlabs/openapi-to-postman/blob/develop/CHANGELOG.md)
- [Commits](postmanlabs/openapi-to-postman@v4.25.0...v6.0.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-version: 8.18.0
  dependency-type: indirect
- dependency-name: ajv
  dependency-version: 6.14.0
  dependency-type: indirect
- dependency-name: openapi-to-postmanv2
  dependency-version: 6.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

package-lock.json

@@ -23,7 +23,7 @@
     "flatted": "^3.2.7",
     "jsonpath-plus": "^10.0.7",
     "lodash": "^4.17.23",
-    "openapi-to-postmanv2": "^4.12.0",
+    "openapi-to-postmanv2": "^6.0.0",
     "remove-markdown": "^0.3.0",
     "standard": "^16.0.1",
     "uuid": "^8.0.0",