build(deps): bump rayon from 1.3.1 to 1.4.0

Bumps [rayon](https://github.com/rayon-rs/rayon) from 1.3.1 to 1.4.0.
- [Release notes](https://github.com/rayon-rs/rayon/releases)
- [Changelog](https://github.com/rayon-rs/rayon/blob/master/RELEASES.md)
- [Commits](https://github.com/rayon-rs/rayon/compare/v1.3.1...rayon-core-v1.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Cargo.toml

@@ -34,7 +34,7 @@ dirs-next = "1.0.1"
 git2 = { version = "0.13.10", default-features = false }
 toml = { version = "0.5.6", features = ["preserve_order"] }
 serde_json = "1.0.57"
-rayon = "1.3.1"
+rayon = "1.4.0"
 pretty_env_logger = "0.4.0"
 log = "0.4.11"
 # battery is optional (on by default) because the crate doesn't currently build for Termux