chore(deps): bump logger from 1.6.1 to 1.7.0 in /example

Bumps [logger](https://github.com/ruby/logger) from 1.6.1 to 1.7.0.
- [Release notes](https://github.com/ruby/logger/releases)
- [Commits](ruby/logger@v1.6.1...v1.7.0)

---
updated-dependencies:
- dependency-name: logger
  dependency-version: 1.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

example/Gemfile.lock

@@ -79,7 +79,7 @@ GEM
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     json (2.8.1)
-    logger (1.6.1)
+    logger (1.7.0)
     minitest (5.25.1)
     molinillo (0.8.0)
     mutex_m (0.3.0)