Prep for release

libraries/liblmdb/CHANGES

 LMDB 0.9 Change Log
 
-LMDB 0.9.31 Engineering
+LMDB 0.9.31 Release (2023/06/27)
 	ITS#8447 - Fix cursor_put(MDB_CURRENT) on DUPSORT DB with different sized data
 
 LMDB 0.9.30 Release (2023/02/08)

libraries/liblmdb/lmdb.h

@@ -200,7 +200,7 @@ typedef int mdb_filehandle_t;
 /** Library minor version */
 #define MDB_VERSION_MINOR	9
 /** Library patch version */
-#define MDB_VERSION_PATCH	30
+#define MDB_VERSION_PATCH	31
 
 /** Combine args a,b,c into a single integer for easy version comparisons */
 #define MDB_VERINT(a,b,c)	(((a) << 24) | ((b) << 16) | (c))
@@ -210,7 +210,7 @@ typedef int mdb_filehandle_t;
 	MDB_VERINT(MDB_VERSION_MAJOR,MDB_VERSION_MINOR,MDB_VERSION_PATCH)
 
 /** The release date of this library version */
-#define MDB_VERSION_DATE	"February 8, 2023"
+#define MDB_VERSION_DATE	"June 27, 2023"
 
 /** A stringifier for the version info */
 #define MDB_VERSTR(a,b,c,d)	"LMDB " #a "." #b "." #c ": (" d ")"