Bump unicorn from 5.5.2 to 5.5.3

Bumps [unicorn](https://yhbt.net/unicorn/) from 5.5.2 to 5.5.3.

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f