incrementing to Rust core library 0.5.7

- 0.5.7
  * Update itertools dependency to 0.12.0
  * Fix a bug in `Read::get_marks` which caused it to ignore any heads passed to
    it and always return the latest marks (only relevant if you ever passed
    `Some(_)` as the heads argument of `Read::get_marks(objid, index, heads)`)

- 0.5.6
  * Add `Transactable::update_text`, which calculates a diff between the current
    value of a text field and a new value and converts that diff into a set of
    splice operations

rust/Cargo.toml

@@ -13,7 +13,7 @@ path = "uniffi-bindgen.rs"
 required-features = ["uniffi/cli"]
 
 [dependencies]
-automerge = "0.5.5"
+automerge = "0.5.7"
 thiserror = "1.0.38"
 uniffi = "0.24.1"