fix: add final modifier to local variables for checkstyle

Fixed checkstyle violations by adding final modifier to local variables in InMemoryMaterializationRepoExample test file.

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Co-Authored-By: Claude <[email protected]>

Author: nicklasl

openfeature-provider-local/src/test/java/com/spotify/confidence/InMemoryMaterializationRepoExample.java

@@ -1,4 +1,4 @@
-package org.example;
+package com.spotify.confidence;
 
 import com.spotify.confidence.MaterializationInfo;
 import com.spotify.confidence.MaterializationRepository;
@@ -11,7 +11,7 @@
 
 public class InMemoryMaterializationRepoExample implements MaterializationRepository {
 
-  private static final Logger logger = LoggerFactory.getLogger(InMemoryMaterializationRepo.class);
+  private static final Logger logger = LoggerFactory.getLogger(InMemoryMaterializationRepoExample.class);
   private final Map<String, Map<String, MaterializationInfo>> storage = new ConcurrentHashMap<>();
 
   /**