Bump spatie/backtrace from 1.5.3 to 1.6.1 in /app

Bumps [spatie/backtrace](https://github.com/spatie/backtrace) from 1.5.3 to 1.6.1.
- [Release notes](https://github.com/spatie/backtrace/releases)
- [Changelog](https://github.com/spatie/backtrace/blob/main/CHANGELOG.md)
- [Commits](spatie/backtrace@1.5.3...1.6.1)

---
updated-dependencies:
- dependency-name: spatie/backtrace
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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