fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-DEBUG-3227433

Author: snyk-bot

package-lock.json

@@ -23,7 +23,7 @@
     "@primer/css": "^16.2.0",
     "@primer/octicons": "^13.0.0",
     "ajv": "^6.12.6",
-    "algoliasearch": "^3.35.1",
+    "algoliasearch": "^4.0.0",
     "assert": "^2.0.0",
     "babel-loader": "^8.1.0",
     "babel-preset-env": "^1.7.0",