Bump setup-dlang to v2 #239

Job	Run time
Run all tests (dmd-latest, ubuntu-22.04, dub, current)	1m 2s
Run all tests (dmd-latest, ubuntu-22.04, make)	1m 15s
Run all tests (dmd-latest, ubuntu-22.04, dub, min libdparse)	49s
Run all tests (dmd-latest, macos-latest, dub, current)	2m 44s
Run all tests (ldc-latest, ubuntu-22.04, make)	1m 44s
Run all tests (dmd-latest, windows-latest, dub, current)	1m 53s
Run all tests (dmd-latest, windows-latest, make)	1m 25s
Run all tests (dmd-latest, macos-latest, make)	18m 6s
Run all tests (ldc-latest, macos-latest, make)	27m 1s
Run all tests (dmd-latest, macos-latest, dub, min libdparse)	2m 6s
Run all tests (dmd-latest, windows-latest, dub, min libdparse)	1m 18s
Run all tests (ldc-latest, ubuntu-22.04, dub, min libdparse)	1m 11s
Run all tests (ldc-latest, windows-latest, dub, current)	2m 11s
Run all tests (ldc-latest, macos-latest, dub, min libdparse)	1m 7s
Run all tests (ldc-latest, ubuntu-22.04, dub, current)	1m 6s
Run all tests (ldc-latest, macos-latest, dub, current)	1m 14s
Run all tests (ldc-latest, windows-latest, make)	2m 3s
Run all tests (gdc-12, ubuntu-22.04, make)	36s
Run all tests (ldc-latest, windows-latest, dub, min libdparse)	1m 43s
Run all tests (gdc-12, ubuntu-22.04, dub, min libdparse)	53s
Run all tests (gdc-12, ubuntu-22.04, dub, current)	1m 43s
	1h 13m 10s

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