Bump steep from 1.8.2 to 1.8.3 in /gemfile_steep

Bumps [steep](https://github.com/soutaro/steep) from 1.8.2 to 1.8.3.
- [Release notes](https://github.com/soutaro/steep/releases)
- [Changelog](https://github.com/soutaro/steep/blob/master/CHANGELOG.md)
- [Commits](soutaro/steep@v1.8.2...v1.8.3)

---
updated-dependencies:
- dependency-name: steep
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gemfile_steep/Gemfile.lock

@@ -45,7 +45,7 @@ GEM
     rbs (3.6.1)
       logger
     securerandom (0.3.2)
-    steep (1.8.2)
+    steep (1.8.3)
       activesupport (>= 5.1)
       concurrent-ruby (>= 1.1.10)
       csv (>= 3.0.9)