deps: bump golang.org/x/sync from 0.3.0 to 0.5.0

[dependabot[bot]]

Bumps golang.org/x/sync from 0.3.0 to 0.5.0.

Commits

• 10739b0 all: update go directive to 1.18
• 22ba207 singleflight: add panicError.Unwrap method
• See full diff in compare view

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[dependabot[bot]]

Looks like golang.org/x/sync is up-to-date now, so this is no longer needed.