fix: upgrade nan from 2.19.0 to 2.20.0

Snyk has created this PR to upgrade nan from 2.19.0 to 2.20.0.

See this package in npm:
nan

See this project in Snyk:
https://app.snyk.io/org/aerospike-clients/project/d16612a8-60d2-4883-b646-53255d23214a?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -59,7 +59,7 @@
     "@mapbox/node-pre-gyp": "^1.0.11",
     "bindings": "^1.5.0",
     "minimatch": "^3.1.2",
-    "nan": "^2.19.0",
+    "nan": "^2.20.0",
     "node-gyp": "^10.1.0",
     "npm-run-all": "^4.1.5"
   },