v26.06.6 Quantum-Resistant Lightning Channel VI

[26.06.6] - 2026-07-20: "Quantum-Resistant Lightning Channel VI" v26.06.3, v26.06.4, and v26.06.5 had issues during publishing with the pypi releases and were deleted. Fixed update pyln-proto's coincurve to a v21 fork to fix Python build environments ( #9325 ) reject a channel that reuses an existing funding outpoint ( #9318 ) Contributors Thanks to the Lightning team and our community…