Bump org.hsqldb:hsqldb in /samples/classic-turnkey-samples/backend

Bumps org.hsqldb:hsqldb from 1.8.0.10 to 2.7.1.

---
updated-dependencies:
- dependency-name: org.hsqldb:hsqldb
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
1 file changed