chore(py): release tket2-exts 0.3.0 (#725) #2425

Job	Run time
Check for changes	7s
Check Python code 🐍	1m 54s
Check Rust code 🦀	1m 41s
tests (Rust stable, all features)	1m 57s
Build benchmarks 🏋️	4m 0s
tests (Rust stable, no features)	2m 13s
tests (Rust nightly, coverage)	2m 17s
tests (Python, coverage)	1m 56s
tests (Rust 1.75)	2m 47s
tests (Rust beta)	2m 40s
Check standard extensions	51s
Required checks 🦀+🐍	1s
	22m 24s

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