bump ptrack version to 1.6

Author: alubennikova

src/include/access/ptrack.h

@@ -8,9 +8,9 @@
 #include "utils/relcache.h"
 
 /* Ptrack version as a string */
-#define PTRACK_VERSION "1.5"
+#define PTRACK_VERSION "1.6"
 /* Ptrack version as a number */
-#define PTRACK_VERSION_NUM 105
+#define PTRACK_VERSION_NUM 106
 
 /* Number of bits allocated for each heap block. */
 #define PTRACK_BITS_PER_HEAPBLOCK 1