undo last commit and update testng to 7.3.0

pom.xml

@@ -203,6 +203,7 @@
         <dependency>
             <groupId>org.testng</groupId>
             <artifactId>testng</artifactId>
+            <version>7.3.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>

src/main/java/io/trino/plugin/tiledb/TileDBClient.java

@@ -319,10 +319,4 @@ public Context buildContext(ConnectorSession session) throws TileDBError
         }
         return localCtx;
     }
-
-    public long getFreeMemory()
-    {
-        long usedMemory = Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory();
-        return Runtime.getRuntime().maxMemory() - usedMemory;
-    }
 }