Bump test/fixtures/prism from b12fe69 to 09d9ac3

Bumps [test/fixtures/prism](https://github.com/ruby/prism) from `b12fe69` to `09d9ac3`.
- [Release notes](https://github.com/ruby/prism/releases)
- [Commits](ruby/prism@b12fe69...09d9ac3)

---
updated-dependencies:
- dependency-name: test/fixtures/prism
  dependency-version: '09d9ac3d6cc93a049144ad057b0feb3013081690'
  dependency-type: direct:production
...

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

Author: dependabot[bot]