Make `scheme` a cached property as well #973

Job	Run time
⚙️ Pre-set global build settings	1s
lint / Linter	2m 16s
📦 Build distribution packages	9s
📦 Build wheels for tested arches / Build wheels on ubuntu	2m 41s
📦 Build wheels for tested arches / Build wheels on windows	4m 49s
📦 Build wheels for tested arches / Build wheels on macos	5m 2s
Test (3.13, ubuntu-latest, false)	40s
Test (3.13, macos-latest, false)	47s
Test (3.13, windows-latest, false)	1m 40s
Test (3.13, Y, ubuntu-latest, false)	35s
Test (3.12, ubuntu-latest, false)	32s
Test (3.12, macos-latest, false)	28s
Test (3.12, windows-latest, false)	58s
Test (3.12, Y, ubuntu-latest, false)	36s
Test (3.11, ubuntu-latest, false)	30s
Test (3.11, macos-latest, false)	28s
Test (3.11, windows-latest, false)	1m 9s
Test (3.11, Y, ubuntu-latest, false)	32s
Test (3.10, ubuntu-latest, false)	36s
Test (3.10, macos-latest, false)	30s
Test (3.10, windows-latest, false)	55s
Test (3.10, Y, ubuntu-latest, false)	27s
Test (3.9, ubuntu-latest, false)	36s
Test (3.9, macos-latest, false)	31s
Test (3.9, windows-latest, false)	53s
Test (3.9, Y, ubuntu-latest, false)	33s
Test (3.8, ubuntu-latest, false)	37s
Test (3.8, macos-latest, false)	1m 5s
Test (3.8, windows-latest, false)	58s
Test (3.8, Y, ubuntu-latest, false)	27s
Test (pypy-3.10, Y, false, ubuntu-latest)	1m 6s
Test (pypy-3.9, Y, false, ubuntu-latest)	1m 3s
Test (pypy-3.8, Y, false, ubuntu-latest)	1m 8s
Test matrix status	1s
Pre-Deploy	0s
📦 Build wheels for odd arches${{ '' }}	0s
Deploy	0s
	35m 19s

Provide feedback