…to 5.1.6 [skip ci]

Bumps [io.github.ascopes:protobuf-maven-plugin](https://github.com/ascopes/protobuf-maven-plugin) from 5.1.5 to 5.1.6.
Release notes

*Sourced from [io.github.ascopes:protobuf-maven-plugin's releases](https://github.com/ascopes/protobuf-maven-plugin/releases).*

> v5.1.6
> ------
>
> What's Changed
> --------------
>
> * Forbid unused imports by [`@​ascopes`](https://github.com/ascopes) in [ascopes/protobuf-maven-plugin#1017](https://redirect.github.com/ascopes/protobuf-maven-plugin/pull/1017)
> * Bump actions/checkout from 6 to 7 by [`@​dependabot`](https://github.com/dependabot)[bot] in [ascopes/protobuf-maven-plugin#1019](https://redirect.github.com/ascopes/protobuf-maven-plugin/pull/1019)
> * Added support for Solaris / illumos by [`@​siepkes`](https://github.com/siepkes) in [ascopes/protobuf-maven-plugin#1018](https://redirect.github.com/ascopes/protobuf-maven-plugin/pull/1018)
>
> New Contributors
> ----------------
>
> * [`@​siepkes`](https://github.com/siepkes) made their first contribution in [ascopes/protobuf-maven-plugin#1018](https://redirect.github.com/ascopes/protobuf-maven-plugin/pull/1018)
>
> **Full Changelog**: <ascopes/protobuf-maven-plugin@v5.1.5...v5.1.6>


Commits

* [`7bf0941`](ascopes/protobuf-maven-plugin@7bf0941) [maven-release-plugin] prepare release v5.1.6
* [`f05fe86`](ascopes/protobuf-maven-plugin@f05fe86) Merge pull request [#1018](https://redirect.github.com/ascopes/protobuf-maven-plugin/issues/1018) from siepkes/solaris-support
* [`c932d26`](ascopes/protobuf-maven-plugin@c932d26) Added support for Solaris / illumos
* [`21bb21b`](ascopes/protobuf-maven-plugin@21bb21b) Merge pull request [#1019](https://redirect.github.com/ascopes/protobuf-maven-plugin/issues/1019) from ascopes/dependabot/github\_actions/main/actions/...
* [`3c22c18`](ascopes/protobuf-maven-plugin@3c22c18) Bump actions/checkout from 6 to 7
* [`25529ac`](ascopes/protobuf-maven-plugin@25529ac) Merge pull request [#1017](https://redirect.github.com/ascopes/protobuf-maven-plugin/issues/1017) from ascopes/task/forbid-unused-imports
* [`72c4cda`](ascopes/protobuf-maven-plugin@72c4cda) Forbid unused imports
* [`a9f9e6c`](ascopes/protobuf-maven-plugin@a9f9e6c) [maven-release-plugin] prepare for next development iteration
* See full diff in [compare view](ascopes/protobuf-maven-plugin@v5.1.5...v5.1.6)
  
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