Update cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/i…

…ntegration/BaseCradleCassandraTest.java

Co-authored-by: Oleg Smirnov <[email protected]>

cradle-cassandra/src/test/java/com/exactpro/cradle/cassandra/integration/BaseCradleCassandraTest.java

@@ -168,7 +168,7 @@ protected TestEventToStore generateTestEvent (String scope, Instant start, long
     @NotNull
     protected static Map<PageId, PageInfo> toMap(Collection<PageInfo> result) {
         return result.stream()
-                .collect(Collectors.toMap(
+                .collect(Collectors.toImmutableMap(
                         PageInfo::getId,
                         Function.identity()
                 ));