[XEN-3146] don't disable checksum validation

Author: NotAPenguin0

integration-tests/src/test/java/eu/xenit/solr/backup/s3/SolrBackupTest.java

@@ -206,7 +206,6 @@ private S3Client createInternalClient(
         ClientOverrideConfiguration clientConfig = ClientOverrideConfiguration.builder().build();
 
         S3Configuration configuration = S3Configuration.builder()
-                .checksumValidationEnabled(false)
                 .build();
 
         S3ClientBuilder clientBuilder = S3Client.builder()