build(deps): bump golang.org/x/sync from 0.8.0 to 0.9.0 in the golang-org-dependencies group #153

Job	Run time
Unit tests (ubuntu-latest, oldstable)	44s
Lint	41s
Unit tests (ubuntu-latest, stable)	47s
Unit tests (ubuntu-latest, 1.20)	42s
Unit tests (macos-latest, oldstable)	59s
Unit tests (macos-latest, stable)	48s
Unit tests (macos-latest, 1.20)	45s
Unit tests (windows-latest, oldstable)	1m 23s
Unit tests (windows-latest, stable)	1m 25s
Unit tests (windows-latest, 1.20)	2m 54s
	11m 8s

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