chore(deps): Bump ajv from 6.12.6 to 8.18.0 in /packages/crypto

Bumps [ajv](https://github.com/ajv-validator/ajv) from 6.12.6 to 8.18.0.
- [Release notes](https://github.com/ajv-validator/ajv/releases)
- [Commits](ajv-validator/ajv@v6.12.6...v8.18.0)

---
updated-dependencies:
- dependency-name: ajv
  dependency-version: 8.18.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

packages/crypto/package.json

@@ -34,7 +34,7 @@
         "@arkecosystem/crypto-identities": "1.2.0",
         "@arkecosystem/crypto-networks": "1.2.2",
         "@arkecosystem/utils": "1.3.1",
-        "ajv": "6.12.6",
+        "ajv": "8.18.0",
         "ajv-keywords": "3.4.1",
         "bcrypto": "5.5.2",
         "bip32": "2.0.6",