chore(whippit): update `repo` url #235

Job	Run time
cargo-deny	21s
Rustfmt (stable)	12s
Clippy (stable)	33s
Check (ubuntu-latest, stable)	35s
Clippy (beta)	33s
Check (ubuntu-latest, beta)	37s
Test Suite (ubuntu-latest, stable)	58s
Check (windows-latest, stable)	1m 21s
Test Suite (ubuntu-latest, beta)	55s
Check (windows-latest, beta)	1m 4s
Test Suite (windows-latest, stable)	2m 16s
Check (macOS-latest, stable)	1m 39s
Test Suite (windows-latest, beta)	1m 36s
Check (macOS-latest, beta)	55s
Test Suite (macOS-latest, stable)	1m 21s
Test Suite (macOS-latest, beta)	1m 17s
	16m 13s

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