fix: Fix a typo in Hermes-utils.rb (microsoft#2534)

## Summary:

Discovered when cherry-picking microsoft#2531 into microsoft#2530. I didn't catch it
before because we don't actually run through this part on the main
branch.

## Test Plan:

No effects on main branch, but microsoft#2530 CIs should succeed now.

Co-authored-by: Adam Gleitman <adgleitm@microsoft.com>

Author: amgleitman

packages/react-native/sdks/hermes-engine/hermes-utils.rb

@@ -305,7 +305,7 @@ def findMatchingHermesVersion(package)
         return nil
     end
 
-    if packages['peerDependencies']
+    if package['peerDependencies']
         return package['peerDependencies']['react-native']
     end