chore: bump @docusaurus/theme-common from 3.7.0 to 3.8.1 in /site #833

Job	Run time
verify-flutter / build	1m 3s
verify-dart / build	27s
verify-pana-dart / build	57s
verify-semantic-pull-request / build	4s
verify-spell-check / build	5s
verify-pana-flutter / build	59s
verify-license-check / build	23s
build	4s
	4m 2s

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