Update sled requirement from 0.33 to 0.34

Updates the requirements on [sled](https://github.com/spacejam/sled) to permit the latest version.
- [Release notes](https://github.com/spacejam/sled/releases)
- [Changelog](https://github.com/spacejam/sled/blob/master/CHANGELOG.md)
- [Commits](https://github.com/spacejam/sled/compare/v0.33...v0.34)

Signed-off-by: dependabot[bot] <support@github.com>

lib/Cargo.toml

@@ -18,7 +18,7 @@ all-features = true
 [dependencies]
 lazy_static = "1"
 rocksdb = { version = "0.14", optional = true }
-sled = { version = "0.33", optional = true }
+sled = { version = "0.34", optional = true }
 quick-xml = "0.18"
 rand = "0.7"
 md-5 = "0.9"