fix(deps): update dependency deepl-node to v1.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
deepl-node (source)	1.13.1 -> 1.15.0

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Release Notes

DeepLcom/deepl-node (deepl-node)

v1.15.0

Compare Source

Added

• Added modelType option to translateText() to use models with higher
  translation quality (available for some language pairs), or better latency.
  Options are 'quality_optimized', 'latency_optimized', and 'prefer_quality_optimized'
• Added the modelTypeUsed field to translateText() response, that
  indicates the translation model used when the modelType option is
  specified.

v1.14.0

Compare Source

Added

• Added billedCharacters field to text translation response.

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[renovate]

Branch automerge failure

This PR was configured for branch automerge. However, this is not possible, so it has been raised as a PR instead.

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• Branch has one or more failed status checks

[coveralls]

coverage: 57.758%. remained the same
when pulling ffd2d74 on renovate/deepl-node-1.x
into 948ff37 on devel.