Bump test/fixtures/prism from a8a7c6b to 0aa2363

Bumps [test/fixtures/prism](https://github.com/ruby/prism) from `a8a7c6b` to `0aa2363`.
- [Release notes](https://github.com/ruby/prism/releases)
- [Commits](ruby/prism@a8a7c6b...0aa2363)

---
updated-dependencies:
- dependency-name: test/fixtures/prism
  dependency-version: 0aa2363331769c68df733b89d868f99c8d48ac0a
  dependency-type: direct:production
...

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Author: dependabot[bot]