chore: move to version 0.3.0 (MSRV changed, so we need to bump major)… #530

Job	Run time
Rustfmt check	12s
Rustdoc check for Rust stable	38s
Build for Rust 1.83.0 on ubuntu	29s
Rustdoc check for Rust nightly (experimental)	35s
Clippy validation	17s
Build for Rust 1.83.0 on macos	38s
Build for Rust 1.83.0 on windows	1m 38s
MSRV check for Rust 1.83.0 on ubuntu	49s
Publish dry-run	52s
Build for Rust stable on ubuntu	21s
Code coverage	1m 40s
MSRV check for Rust 1.83.0 on macos	1m 4s
Build for Rust stable on ubuntu without Cargo.lock	31s
MSRV check for Rust 1.83.0 on windows	2m 42s
Build for Rust stable on macos	37s
Build for Rust stable on macos without Cargo.lock	36s
Build for Rust stable on windows	1m 38s
Build for Rust stable on windows without Cargo.lock	1m 20s
Build for Rust beta (experimental) on ubuntu	1m 5s
Build for Rust beta (experimental) on ubuntu without Cargo.lock	1m 3s
Build for Rust beta (experimental) on macos	1m 9s
Build for Rust beta (experimental) on macos without Cargo.lock	1m 25s
Build for Rust beta (experimental) on windows	2m 16s
Build for Rust beta (experimental) on windows without Cargo.lock	2m 16s
Build for Rust nightly (experimental) on ubuntu	1m 5s
Build for Rust nightly (experimental) on ubuntu without Cargo.lock	1m 2s
Build for Rust nightly (experimental) on macos	1m 26s
Build for Rust nightly (experimental) on macos without Cargo.lock	1m 20s
Build for Rust nightly (experimental) on windows	2m 46s
Build for Rust nightly (experimental) on windows without Cargo.lock	2m 8s
	35m 38s

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