Improves IPv6 addresses formatting #531

Job	Run time
Dub Tests (ubuntu-latest, dmd-latest, x86_64)	3m 51s
Dub Tests (ubuntu-latest, ldc-latest, x86_64)	4m 15s
Dub Tests (windows-latest, dmd-latest, x86_64)	4m 24s
Dub Tests (windows-latest, ldc-latest, x86_64)	5m 16s
Dub Tests (macOS-13, dmd-latest, x86_64)	10m 59s
Dub Tests (macOS-13, ldc-latest, x86_64)	12m 8s
Dub Tests (ubuntu-latest, dmd-2.096.1, x86_64)	3m 54s
Dub Tests (windows-latest, dmd-2.092.0, x86_64)	4m 25s
Dub Tests (windows-latest, dmd-2.092.0, x86_mscoff)	4m 30s
Dub Tests (windows-latest, dmd-2.091.1, x86_64)	4m 31s
Dub Tests (windows-latest, ldc-1.20.1, x86_64)	5m 9s
	1h 3m 22s

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