fix: remove unicode pi symbols in rotation extension #2484

Job	Run time
Check for changes	5s
tests (Rust stable, no features)	2m 3s
Check Python code 🐍	2m 29s
Build benchmarks 🏋️	5m 25s
Check Rust code 🦀	2m 23s
tests (Rust stable, all features)	2m 6s
tests (Rust nightly, coverage)	2m 48s
tests (Python, coverage)	2m 30s
tests (Rust 1.75)	2m 57s
tests (Rust beta)	2m 32s
Check standard extensions	1m 13s
Required checks 🦀+🐍	1s
	26m 32s

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