Bump setup-dlang to v2 #243

Job	Run time
Run all tests (dmd-latest, ubuntu-22.04, dub, current)	1m 8s
Run all tests (dmd-latest, ubuntu-22.04, dub, min libdparse)	1m 3s
Run all tests (dmd-latest, windows-latest, make)	1m 27s
Run all tests (dmd-latest, ubuntu-22.04, make)	1m 48s
Run all tests (ldc-latest, ubuntu-22.04, dub, current)	1m 7s
Run all tests (dmd-latest, macos-latest, dub, min libdparse)	2m 24s
Run all tests (dmd-latest, macos-latest, dub, current)	2m 44s
Run all tests (dmd-latest, macos-latest, make)	25m 33s
Run all tests (ldc-latest, ubuntu-22.04, make)	1m 45s
Run all tests (ldc-latest, ubuntu-22.04, dub, min libdparse)	57s
Run all tests (ldc-latest, macos-latest, make)	30m 57s
Run all tests (ldc-latest, macos-latest, dub, min libdparse)	1m 8s
Run all tests (gdc-12, ubuntu-22.04, dub, min libdparse)	3m 0s
Run all tests (gdc-12, ubuntu-22.04, make)	4m 30s
Run all tests (ldc-latest, windows-latest, make)	1m 47s
Run all tests (dmd-latest, windows-latest, dub, current)	1m 55s
Run all tests (ldc-latest, macos-latest, dub, current)	1m 28s
Run all tests (ldc-latest, windows-latest, dub, min libdparse)	1m 39s
Run all tests (ldc-latest, windows-latest, dub, current)	1m 49s
Run all tests (gdc-12, ubuntu-22.04, dub, current)	2m 51s
Run all tests (dmd-latest, windows-latest, dub, min libdparse)	1m 26s
	1h 32m 26s

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