Update dependencies

[christiansiegel]

This PR updates

• the dependency execa to v4.0.0 (latest)
• the peer dependency semantic-release to support versions up to v17 (latest)

Relevant release notes: (I didn't find breaking changes that need changes in this project)

https://github.com/semantic-release/semantic-release/releases/tag/v17.0.0 https://github.com/semantic-release/semantic-release/releases/tag/v16.0.0

https://github.com/sindresorhus/execa/releases/tag/v1.0.0 https://github.com/sindresorhus/execa/releases/tag/v2.0.0 https://github.com/sindresorhus/execa/releases/tag/v3.0.0 https://github.com/sindresorhus/execa/releases/tag/v4.0.0

[wolasss]

+1 this is very much needed. Currently, semantic-release-docker is preventing us from updating to semantic release v17

[Addono]

@felixfbecker