Update module gitlab.com/gitlab-org/labkit to v1.31.5

This MR contains the following updates:

Package	Type	Update	Change
gitlab.com/gitlab-org/labkit	require	minor	v1.29.0 -> 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)

v1.31.5

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Bug Fixes

• tracing: Add back support for formatting derived scalar types. (632cc5b)

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)

v1.31.2

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Bug Fixes

• monitoring: Improve profiler user experience. (2d4cb6a)

v1.31.1

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Bug Fixes

• avoid modifying the original http.Request in RoundTripper (f9545da)

v1.31.0

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Features

• log: added gRPC access logs (3885e29)

v1.30.0

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Features

• adds the new fields package to labkit (3a90f8f)

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