Update cargo manifest (dependencies and formatting) + dependabot

[Mathieu-Lala]

Summary of changes

Changed

• in Cargo.tomls, specify the compete version of the dependencies (see this article)
• in Cargo.tomls, use the workspace notation when relevant
• for all dependencies, explicitly use default-features = false and list the features used
• bump syn to >=2, and update the implementation accordingly
• bump package.edition to 2021

Style

• format the Cargo.tomls files using not yet merged rustfmt, especially this.

Fixed

• two derivable_impls clippy warnings using #[default] enum variants

Added

• dependabot files with weekly update on cargo and github actions dependencies udpate

[Mathieu-Lala]

I realized afterward that is use features higher than MSRV (1.61.0). The required version would be 1.64.

[schungx]

I'd try to avoid excessive formatting changes... that makes it difficult to tell where the changes actually reside.

Also, I see some changes to path.xxx into path().xxx... can you elaborate?

[Mathieu-Lala]

Also, I see some changes to path.xxx into path().xxx... can you elaborate?

I bumped syn to version 2.
syn::Attribute::path went private, and there is a method to access to this field.
https://docs.rs/syn/2.0.27/syn/struct.Attribute.html#method.path
https://docs.rs/syn/1.0.109/syn/struct.Attribute.html#structfield.path

[schungx]

Actually, I have found the minimum versions that compile and run tests successfully:

[dependencies]
smallvec = { version = "1.7.0", default-features = false, features = ["union", "const_new", "const_generics"] }
ahash = { version = "0.8.2", default-features = false, features = ["compile-time-rng"] }
num-traits = { version = "0.2.0", default-features = false }
once_cell = { version = "1.7.0", default-features = false, features = ["race"] }
bitflags = { version = "2.0.0", default-features = false }
smartstring = { version = "1.0.0", default-features = false }
rhai_codegen = { version = "1.5.0", path = "codegen", default-features = false }

no-std-compat = { git = "https://gitlab.com/jD91mZM2/no-std-compat", version = "0.4.1", default-features = false, features = ["alloc"], optional = true }
libm = { version = "0.2.0", default-features = false, optional = true }
hashbrown = { version = "0.13.1", optional = true }
core-error = { version = "0.0.0", default-features = false, features = ["alloc"], optional = true }
serde = { version = "1.0.96", default-features = false, features = ["derive", "alloc"], optional = true }
serde_json = { version = "1.0.45", default-features = false, features = ["alloc"], optional = true }
unicode-xid = { version = "0.2.0", default-features = false, optional = true }
rust_decimal = { version = "1.16.0", default-features = false, features = ["maths"], optional = true }
getrandom = { version = "0.2.0", optional = true }
rustyline = { version = "11.0.0", optional = true }
document-features = { version = "0.2.0", optional = true }

[dev-dependencies]
rmp-serde = "1.1.0"
serde_json = { version = "1.0.45", default-features = false, features = ["alloc"] }

[schungx]

I would much rather set a minimum workable version, and let the user bump to higher if he/she wants.

[schungx]

@Mathieu-Lala why don't I do this: I'll update Cargo.toml with the set of minimal versions first, then let's see what else needs to add.

[Mathieu-Lala]

Sure! Sorry I didn't have time to complete and fix this PR.
I believe not all the changes are interesting, I will let you cherry pick 👍 .

[schungx]

Closing this for now, as the new version will adhere to recommended style by citing the minimum versions of dependencies.