Bump sequel from 5.55.0 to 5.56.0 (#187)

Bumps [sequel](https://github.com/jeremyevans/sequel) from 5.55.0 to 5.56.0.
- [Release notes](https://github.com/jeremyevans/sequel/releases)
- [Changelog](https://github.com/jeremyevans/sequel/blob/master/CHANGELOG)
- [Commits](jeremyevans/sequel@5.55.0...5.56.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -38,7 +38,7 @@ GEM
     rubocop-sequel (0.3.3)
       rubocop (~> 1.0)
     ruby-progressbar (1.11.0)
-    sequel (5.55.0)
+    sequel (5.56.0)
     sqlite3 (1.4.2)
     test-unit (3.5.3)
       power_assert