chore: Upgrade to yarn 4.3.1 (#2148)

## Summary:

Originally, I meant to just update the lock to resolve some CVEs. It
seems our lock is actually clean, so instead I'm updating yarn to the
latest version.

## Test Plan:

CI passes.

.yarnrc.yml

@@ -1,2 +1,3 @@
-nodeLinker: "node-modules"
-yarnPath: .yarn/releases/yarn-4.0.2.cjs
+nodeLinker: node-modules
+
+yarnPath: .yarn/releases/yarn-4.3.1.cjs

package.json

@@ -131,5 +131,5 @@
     "shell-quote": "Versions prior to 1.7.3 have an RCE vulnerability. Should be removable once we upgrade CLI tools to ^8.0.0 with RN 0.69.",
     "tough-cookie": "@definitelytyped/dtslint indirectly depends on this through an out-of-date library, and our particular use case doesn't need cookies"
   },
-  "packageManager": "yarn@4.0.2"
+  "packageManager": "yarn@4.3.1"
 }