RFR: 1636: Revert GitLab workaround when modifying labels

[Erik Helin]

On Thu, 13 Oct 2022 20:56:06 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> The workaround for GitLab returning 500 when modifying labels is not longer needed ([SKARA-1612](https://bugs.openjdk.org/browse/SKARA-1612)).

Looks good!

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Marked as reviewed by ehelin (Reviewer).

PR: https://git.openjdk.org/skara/pull/1398