Update npm to v8 (#340)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [npm](https://docs.npmjs.com/) ([source](https://github.com/npm/cli)) | engines | major | [`^7` -> `^8.0.0`](https://renovatebot.com/diffs/npm/npm/7.24.2/8.3.1) |

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This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

Co-authored-by: Aditya Thakral <github@9at8.dev>
Reviewed-on: #340
Reviewed-by: Aditya Thakral <a3thakra@csclub.uwaterloo.ca>
Co-authored-by: Renovate Bot <no-reply@csclub.uwaterloo.ca>
Co-committed-by: Renovate Bot <no-reply@csclub.uwaterloo.ca>

package-lock.json

@@ -48,7 +48,7 @@
       },
       "engines": {
         "node": "^16",
-        "npm": "^7"
+        "npm": "^8.0.0"
       }
     },
     "node_modules/@babel/code-frame": {

package.json

@@ -3,7 +3,7 @@
   "private": true,
   "engines": {
     "node": "^16",
-    "npm": "^7"
+    "npm": "^8.0.0"
   },
   "scripts": {
     "dev": "next dev",