Upgrade to Next 12.3.2

I didn't really want to do this exactly, but I think installing a global
Typescript binary caused some problems here, where running the app had
started giving me an error like "you need to install `@types/react`!"
and I'm like. I did? years ago?

I searched for the error and people said "oh just upgrade Next" so I did
and now it's fixed I guess? I only bumped up to the latest version of
v12, rather than up to v14 where things are now, to avoid breakages. I
poked around the site ever so slightly and it seems fine, so I'm not
worried about it!

next-env.d.ts

@@ -1,5 +1,4 @@
 /// <reference types="next" />
-/// <reference types="next/types/global" />
 /// <reference types="next/image-types/global" />
 
 // NOTE: This file should not be edited

package.json

@@ -20,7 +20,7 @@
     "@testing-library/react": "^9.3.2",
     "@testing-library/user-event": "^7.1.2",
     "@types/node": "^14.14.22",
-    "@types/react": "^17.0.1",
+    "@types/react": "^18.2.34",
     "@types/react-dom": "^17.0.0",
     "apollo-link-persisted-queries": "^0.2.2",
     "apollo-server": "^2.25.3",
@@ -43,7 +43,7 @@
     "jwks-rsa": "^1.9.0",
     "lru-cache": "^6.0.0",
     "mysql2": "^2.1.0",
-    "next": "12.0.2",
+    "next": "12.3.2",
     "node-fetch": "^2.6.0",
     "puppeteer": "^11.0.0",
     "react": "^17.0.1",