Upgrade cargo_toml to v0.20

Summary:
Cargo.toml `[profile]` debug section doesn't have to be integer any more, see [cargo doc](https://doc.rust-lang.org/cargo/reference/profiles.html#debug). This is needed for `arc autocargo` to work, when importing `rav1d` crate, see Cargo.toml [link](https://github.com/memorysafety/rav1d/blob/8e1a34eca2b92c9b76c0d2123a098d8f8a183024/Cargo.toml#L61), and P1680061395 for errors when running `arc autocargo`. Notice `arc autocargo` uses dotslash binaries, hence it may take sometime for this diff to take effect (see [link](https://www.internalfb.com/intern/msdk/bump/autocargo)).

Unfortunately v0.20 has breaking changes, below is a summary of changes other than third-party rust:

- Updated `cargo_from_buck` (actual code changes & tests).
- Fixed linter test cases (toml_edit changes?).
- Fixed buck_auto_mode testes.
- Fixed smore/store/cold.rs unittests.

Reviewed By: capickett

Differential Revision: D66017293

fbshipit-source-id: cfb0f1edb42ec0d28d87d0ba46b7de6081547dd9

Cargo.toml

@@ -11,7 +11,7 @@ license = "MIT"
 [dependencies]
 anyhow = "1.0.86"
 cached = "0.39.0"
-cargo_toml = "0.17.2"
+cargo_toml = "0.20.5"
 clap = { version = "4.5.20", features = ["derive", "env", "string", "unicode", "wrap_help"] }
 dunce = "1.0.2"
 env_logger = "0.10"