Update module theckman/go-flock to v0.8.0

This MR contains the following updates:

Package	Type	Update	Change
github.com/theckman/go-flock	require	minor	v0.7.1 -> v0.8.0

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Release Notes

theckman/go-flock

v0.8.0

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• Add AIX platform support (#​40 / @​Helflym)

v0.7.3

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• Fix issues in the license file, update year.

v0.7.2

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• Ensure we release file handle if we failed to take an exclusive lock (#​43 / @​azr, #​31 / @​virtuald)

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