Bump @antora/collector-extension from 1.0.0-alpha.3 to 1.0.0-beta.2 in /docs #3936

Job	Run time
build	4m 56s
test_when_cache_present (0, 9, 644)	22m 8s
test_when_cache_missing	0s
test_when_cache_present (1, 9, 644)	21m 57s
test_when_cache_present (2, 9, 644)	23m 0s
test_when_cache_present (3, 9, 644)	21m 38s
test_when_cache_present (4, 9, 644)	22m 14s
test_when_cache_present (5, 9, 644)	23m 28s
test_when_cache_present (6, 9, 644)	21m 54s
test_when_cache_present (7, 9, 644)	22m 23s
test_when_cache_present (8, 9, 644)	28m 14s
test_when_cache_present (9, 9, 644)	11m 9s
save_test_times_when_cache_missing	0s
save_test_times_when_cache_present	6s
	3h 43m 7s

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