Bump test/fixtures/prism from d76f295 to aa8b60c

Bumps [test/fixtures/prism](https://github.com/ruby/prism) from `d76f295` to `aa8b60c`.
- [Release notes](https://github.com/ruby/prism/releases)
- [Commits](ruby/prism@d76f295...aa8b60c)

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

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

Author: dependabot[bot]