React to feeback and change to use 0.2.0 cache package

src/save.ts

@@ -18,7 +18,7 @@ async function run(): Promise<void> {
         const state = utils.getCacheState();
 
         // Inputs are re-evaluted before the post action, so we want the original key used for restore
-        const primaryKey = core.getState(State.CacheKey);
+        const primaryKey = core.getState(State.CachePrimaryKey);
         if (!primaryKey) {
             utils.logWarning(`Error retrieving key from state.`);
             return;