Update main version.h to NEXT release (7.3) (#9852)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9852

Reviewed By: ajkr

Differential Revision: D35694753

Pulled By: jay-zhuang

fbshipit-source-id: 729d416afc588e5db2367e899589bbb5419820d6

include/rocksdb/version.h

@@ -12,7 +12,7 @@
 // NOTE: in 'main' development branch, this should be the *next*
 // minor or major version number planned for release.
 #define ROCKSDB_MAJOR 7
-#define ROCKSDB_MINOR 2
+#define ROCKSDB_MINOR 3
 #define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with