go: Update module gitlab.com/gitlab-org/labkit to v1.31.4

This MR contains the following updates:

Package	Type	Update	Change	Pending
gitlab.com/gitlab-org/labkit	require	patch	v1.31.2 -> v1.31.4	v1.31.5

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

gitlab-org/labkit (gitlab.com/gitlab-org/labkit)

v1.31.4

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Bug Fixes

• tracing: Fix formatting of url.URL attributes. (65ea481), closes gitlab-org/labkit#78

v1.31.3

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Bug Fixes

• tracing: Add the service.name default attribute in the Stackdriver tracer. (cb75dab)

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