Bump rocksdb from 858ce71 to d6aec5a

Bumps [rocksdb](https://github.com/rust-rocksdb/rust-rocksdb) from `858ce71` to `d6aec5a`.
- [Release notes](https://github.com/rust-rocksdb/rust-rocksdb/releases)
- [Commits](rust-rocksdb/rust-rocksdb@858ce71...d6aec5a)

---
updated-dependencies:
- dependency-name: rocksdb
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>