Update the release version in preparation for 0.9.0-preview

[johnewing1]

Fix the release script. OSX toolchain no longer supports building 386 binaries, so the darwin/386 combination throws an error https://support.apple.com/en-us/HT208436

---

Description

Update the version number in preparation for cutting new release

Fix an issue where the release.sh script will not complete because apple have removed Darwin 386 support from the toolchain

https://developer.apple.com/documentation/xcode-release-notes/xcode-10-release-notes?preferredLanguage=occ

Works towards #2230 (fill in)

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

How has this been tested?

Checklist:

• [x] This contribution follows the project's code of conduct
• [x] This contribution follows the project's contributing guidelines
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules