Update schemas for ASDF standard 1.6.0 #273

Job	Run time
Run asdf-astropy development tests	2m 36s
Run asdf-astropy development tests	2m 24s
Python 3.12 Schema validation tests	15s
Python 3.12 Schema validation tests	3m 19s
Python 3.11 Schema validation tests	18s
Python 3.11 Schema validation tests	2m 56s
Python 3.10 Schema validation tests	16s
Python 3.10 Schema validation tests	3m 35s
Python 3.9 Schema validation tests	16s
Python 3.9 Schema validation tests	4m 10s
Twine check	31s
Twine check	46s
Code style checks	34s
Code style checks	53s
macOS	31s
macOS	5m 12s
Windows	19s
Windows	4m 44s
	33m 35s

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