Synchronize listing tables in file metastore

This is to prevent listing tables failures when tables dropped
concurrently. This also fixes IDE warning about synchronization not
matching `@GuardedBy` annotations.

plugin/trino-hive/src/main/java/io/trino/plugin/hive/metastore/file/FileHiveMetastore.java

@@ -521,7 +521,7 @@ public synchronized void updatePartitionStatistics(Table table, StatisticsUpdate
     }
 
     @Override
-    public List<TableInfo> getTables(String databaseName)
+    public synchronized List<TableInfo> getTables(String databaseName)
     {
         return listAllTables(databaseName);
     }