Update to version 6.28 (#9312)

Summary: Pull Request resolved: https://github.com/facebook/rocksdb/pull/9312

Reviewed By: ajkr

Differential Revision: D33196324

Pulled By: akankshamahajan15

fbshipit-source-id: 471da75eaedc54d3151672adc28643bc1d6fdf23

HISTORY.md

 # Rocksdb Change Log
-## Unreleased
+## 6.28.0 (2021-12-17)
 ### New Features
 * Introduced 'CommitWithTimestamp' as a new tag. Currently, there is no API for user to trigger a write with this tag to the WAL. This is part of the efforts to support write-commited transactions with user-defined timestamps.
 

include/rocksdb/version.h

@@ -10,7 +10,7 @@
 #include "rocksdb/rocksdb_namespace.h"
 
 #define ROCKSDB_MAJOR 6
-#define ROCKSDB_MINOR 27
+#define ROCKSDB_MINOR 28
 #define ROCKSDB_PATCH 0
 
 // Do not use these. We made the mistake of declaring macros starting with