fix(cli): add MaybeWorkspace to license field

[Andreybest]

Got the bug in a project after updating to latest v2-alpha.
And got this error:

> pnpm tauri dev

       Error failed to load cargo settings: failed to parse Cargo.toml: TOML parse error at line 6, column 11
  |
6 | license = { workspace = true }
  |           ^^^^^^^^^^^^^^^^^^^^
invalid type: map, expected a string

 ELIFECYCLE  Command failed with exit code 1.

From what I saw in a code, license field was expected to be either String or None, but not workspace. Made it same as other fields (by copy-pasting code from them).

I think that it should work with any other case, but at least it fixes my issue. Let me know if I made something wrong. Will try to be fast with responses.

Checks

• cargo test passes
• cargo clippy passes
• cargo fmt locally passes
• if cli installed with cargo install and used via cargo tauri dev with a license field like license = { workspace = true }, exception is not being thrown

[FabianLars]

Thanks for contributing! Could you also add a changefile similar to https://github.com/tauri-apps/tauri/blob/dev/.changes/cli-config-target-mobile.md please?

[Andreybest]

@FabianLars Added, hope my phrasing is correct here.