Update the cargo-deny-action version

Update GitHub Actions versions

Test against Rust 1.89

Bump the ring dependency

Pin dtolnay/rust-toolchain to a specific commit

Replace Ruby versions script with a shell script

Release v0.6.0

Update ureq to v3

Update various dependencies

Fix clippy warnings

Fix incorrect code formatting

Fix various clippy warnings

Update the Rust versions to require/test against

Remove mentions of Windows support

Remove gitlint config