fix(ts): correctly expose next-auth/adapters

Fixes #8283 (comment)

Author: balazsorban44

packages/next-auth/package.json

@@ -31,6 +31,9 @@
       "types": "./index.d.ts",
       "import": "./index.js"
     },
+    "./adapters": {
+      "types": "./adapters.d.ts"
+    },
     "./jwt": {
       "types": "./jwt/index.d.ts",
       "import": "./jwt/index.js"