fix: add final modifier to local variables for checkstyle

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

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

Author: nicklasl

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

@@ -21,19 +21,19 @@ public class InMemoryMaterializationRepoExample implements MaterializationReposi
    * @return A map containing the key and a default MaterializationInfo object.
    */
   private static Map<String, MaterializationInfo> createEmptyMap(String key) {
-    MaterializationInfo emptyInfo = new MaterializationInfo(false, new HashMap<>());
-    Map<String, MaterializationInfo> map = new HashMap<>();
+    final MaterializationInfo emptyInfo = new MaterializationInfo(false, new HashMap<>());
+    final Map<String, MaterializationInfo> map = new HashMap<>();
     map.put(key, emptyInfo);
     return map;
   }
 
   @Override
   public CompletableFuture<Map<String, MaterializationInfo>> loadMaterializedAssignmentsForUnit(
       String unit, String materialization) {
-    Map<String, MaterializationInfo> unitAssignments = storage.get(unit);
+    final Map<String, MaterializationInfo> unitAssignments = storage.get(unit);
     if (unitAssignments != null) {
       if (unitAssignments.containsKey(materialization)) {
-        Map<String, MaterializationInfo> result = new HashMap<>();
+        final Map<String, MaterializationInfo> result = new HashMap<>();
         result.put(materialization, unitAssignments.get(materialization));
         logger.debug("Cache hit for unit: {}, materialization: {}", unit, materialization);
         return CompletableFuture.supplyAsync(() -> result);
@@ -67,15 +67,15 @@ public CompletableFuture<Void> storeAssignment(
           } else {
             // If an entry exists, merge the new assignments into it.
             // This is equivalent to Kotlin's 'existingEntry.plus(assignments ?: emptyMap())'.
-            Map<String, MaterializationInfo> newEntry = new HashMap<>(existingEntry);
+            final Map<String, MaterializationInfo> newEntry = new HashMap<>(existingEntry);
             if (assignments != null) {
               newEntry.putAll(assignments);
             }
             return newEntry;
           }
         });
 
-    int assignmentCount = (assignments != null) ? assignments.size() : 0;
+    final int assignmentCount = (assignments != null) ? assignments.size() : 0;
     logger.debug("Stored {} assignments for unit: {}", assignmentCount, unit);
 
     return CompletableFuture.completedFuture(null);