Update module honeycombio/libhoney-go to v1.8.1

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
github.com/honeycombio/libhoney-go	require	minor	v1.8.1	source

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Release Notes

honeycombio/libhoney-go

v1.8.1

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v1.8.0

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