Update module golang.org/x/sync to v0.7.0

This MR contains the following updates:

Package	Type	Update	Change
golang.org/x/sync	require	minor	v0.6.0 -> v0.7.0

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This MR has been generated by Renovate Bot.

mentioned in issue #2 (closed)

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mentioned in issue #3

mentioned in commit 07d60e56

merged