chore(deps): update dependency @semantic-release/gitlab to v8

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@semantic-release/gitlab	7.2.1 -> 8.1.0

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Release Notes

semantic-release/gitlab

v8.1.0

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Features

• add HTTP(S) proxy support (#​310) (74cad24)

v8.0.2

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Bug Fixes

• success-comment: add missing dot and line break to improve readability (#​353) (87c0246), closes #​351

v8.0.1

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Bug Fixes

• display default icons and fix URL in success message (#​342) (e6fa727), closes #​344

v8.0.0

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Features

• comment on issues and merge requests resolved by current release (#​340) (42c31ac)

BREAKING CHANGES

• By default all related issues and MRs are commented. Set the successComment option to false to disable this behavior.

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