Fix libsql crate git URL

The `vector` branch was rebased, which means the commit went away.
Switch to branch instead.

Author: penberg

Cargo.lock

@@ -12,7 +12,7 @@ crate-type = ["cdylib"]
 
 [dependencies]
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
-libsql = { git = "https://github.com/libsql/libsql/", rev = "fc8521e2d387f82a8dde4587624fb4ba9c95487e", features = ["encryption"] }
+libsql = { git = "https://github.com/tursodatabase/libsql/", branch = "vector", features = ["encryption"] }
 tracing = "0.1"
 once_cell = "1.18.0"
 tokio = { version = "1.29.1", features = [ "rt-multi-thread" ] }