build(deps): bump solana-program-test from 2.1.7 to 2.1.8 (#82)

Bumps [solana-program-test](https://github.com/anza-xyz/agave) from 2.1.7 to 2.1.8.
- [Release notes](https://github.com/anza-xyz/agave/releases)
- [Changelog](https://github.com/anza-xyz/agave/blob/master/CHANGELOG.md)
- [Commits](anza-xyz/agave@v2.1.7...v2.1.8)

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

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Author: dependabot[bot]