Bump coveralls from 0.7.1 to 0.8.19

Bumps [coveralls](https://coveralls.io) from 0.7.1 to 0.8.19.

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