Update ConditionEvaluator.java

Author: rathovarun1032

src/main/java/com/google/firebase/remoteconfig/ConditionEvaluator.java

@@ -21,6 +21,7 @@
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import static com.google.common.collect.ImmutableMap.toImmutableMap;
 import com.google.firebase.internal.NonNull;
 import com.google.firebase.internal.Nullable;
 import java.math.BigInteger;
@@ -64,7 +65,7 @@ Map<String, Boolean> evaluateConditions(
     Map<String, Boolean> evaluatedConditions =
         conditions.stream()
             .collect(
-                ImmutableMap.toImmutableMap(
+                toImmutableMap(
                     ServerCondition::getName,
                     condition ->
                         evaluateCondition(