rocksdb: update submodule to fix FTBFS due to missing <cstdint>

59afb3d6 bumped rocksdb submodule in hope to address the FTBFS failure
when building rocksdb with GCC 16, but the tree still failed to build:

```
In file included from /ceph/src/rocksdb/include/rocksdb/trace_record_result.h:14,
                 from /ceph/src/rocksdb/trace_replay/trace_record_result.cc:6:
/ceph/src/rocksdb/include/rocksdb/trace_record.h:55:32: error: expected ')' before 'timestamp'
   55 |   explicit TraceRecord(uint64_t timestamp);
      |                       ~        ^~~~~~~~~~
      |                                )
/ceph/src/rocksdb/include/rocksdb/trace_record.h:63:11: error: 'uint64_t' does not name a type
   63 |   virtual uint64_t GetTimestamp() const;
      |           ^~~~~~~~
/ceph/src/rocksdb/include/rocksdb/trace_record.h:1:1: note: 'uint64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
```

in this change, we cherry-pick upstream fix to address this build
failure.

Signed-off-by: Kefu Chai <k.chai@proxmox.com>

diff --git a/src/rocksdb b/src/rocksdb
index af6e913d15956f15ab888d1d0eb13120f462acba..c7a7c6340c522d2ecc21625e2b726554cb61eb72 160000 (submodule)
--- a/src/rocksdb
+++ b/src/rocksdb
@@ -1 +1 @@
-Subproject commit af6e913d15956f15ab888d1d0eb13120f462acba
+Subproject commit c7a7c6340c522d2ecc21625e2b726554cb61eb72