build(deps): bump solana-program-test from 3.0.7 to 3.0.8 (#144)

Bumps [solana-program-test](https://github.com/anza-xyz/agave) from 3.0.7 to 3.0.8.
- [Release notes](https://github.com/anza-xyz/agave/releases)
- [Changelog](https://github.com/anza-xyz/agave/blob/master/CHANGELOG.md)
- [Commits](anza-xyz/agave@v3.0.7...v3.0.8)

---
updated-dependencies:
- dependency-name: solana-program-test
  dependency-version: 3.0.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]