Feature/GitHub actions (DBraun#47)

Bump urllib3 from 1.25.10 to 1.26.5 (DBraun#29)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.25.10 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.25.10...1.26.5)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Develop (DBraun#18)

* add warning for when a plugin isn't found
* fix crashes when rendering some vst3 effects plugins that involve secondary buses (sidechain compression for example).