Bump test/fixtures/prism from 7f62971 to e6d7144

Bumps [test/fixtures/prism](https://github.com/ruby/prism) from `7f62971` to `e6d7144`.
- [Release notes](https://github.com/ruby/prism/releases)
- [Commits](ruby/prism@7f62971...e6d7144)

---
updated-dependencies:
- dependency-name: test/fixtures/prism
  dependency-version: e6d71445b84587934d49ebd3572b23dd1ccb6b60
  dependency-type: direct:production
...

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

Author: dependabot[bot]