Fix error type so that size limit violation is shown as warning

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/cache",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@actions/cache",
-  "version": "2.0.1",
+  "version": "2.0.2",
   "preview": true,
   "description": "Actions cache lib",
   "keywords": [

src/cache.ts

@@ -197,7 +197,7 @@ export async function saveCache(
     if (reserveCacheResponse?.result?.cacheId) {
       cacheId = reserveCacheResponse?.result?.cacheId
     } else if (reserveCacheResponse?.statusCode === 400) {
-      throw new ReserveCacheError(
+      throw new Error(
         reserveCacheResponse?.error?.message ??
           `Cache size of ~${Math.round(
             archiveFileSize / (1024 * 1024)