fix: stop re-exporting exports removed in remix 2.12.0

These unstable functions and types were removed in
remix-run/remix#9893.

Since they were clearly named `unstable_` and Remix doesn't require
major releases for changes to these, we'll do the same thing.

packages/remix-runtime/package.json

@@ -33,7 +33,7 @@
   },
   "homepage": "https://github.com/netlify/remix-compute#readme",
   "devDependencies": {
-    "@remix-run/server-runtime": "^2.9.2",
+    "@remix-run/server-runtime": "^2.12.0",
     "tsup": "^8.0.2"
   },
   "peerDependencies": {

packages/remix-runtime/src/index.ts

@@ -26,12 +26,13 @@ export {
   unstable_composeUploadHandlers,
   unstable_createMemoryUploadHandler,
   unstable_parseMultipartFormData,
-  unstable_defineLoader,
-  unstable_defineAction,
   unstable_setDevServerHooks,
   UNSAFE_SingleFetchRedirectSymbol,
 } from '@remix-run/server-runtime'
 
+// TODO(serhalp) The docs say we should simply re-export all types from `/reexport`:
+// https://github.com/remix-run/remix/tree/main/packages/remix-server-runtime#readme.
+// Let's do that, but carefully verify whether this adds or removes any exports first.
 export type {
   ActionFunction,
   ActionFunctionArgs,
@@ -78,9 +79,6 @@ export type {
   UnsignFunction,
   UploadHandlerPart,
   UploadHandler,
-  unstable_Loader,
-  unstable_Action,
-  unstable_Serialize,
   UNSAFE_SingleFetchResults,
   UNSAFE_SingleFetchResult,
 } from '@remix-run/server-runtime'