Bump tools/bids-examples from ad9db4b to 7c18d68

Bumps [tools/bids-examples](https://github.com/bids-standard/bids-examples) from `ad9db4b` to `7c18d68`.
- [Release notes](https://github.com/bids-standard/bids-examples/releases)
- [Commits](bids-standard/bids-examples@ad9db4b...7c18d68)

---
updated-dependencies:
- dependency-name: tools/bids-examples
  dependency-type: direct:production
...

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