build(deps-dev): bump solargraph from 0.55.4 to 0.56.0 (#4435)

Bumps [solargraph](https://github.com/castwide/solargraph) from 0.55.4 to 0.56.0.
- [Changelog](https://github.com/castwide/solargraph/blob/master/CHANGELOG.md)
- [Commits](castwide/solargraph@v0.55.4...v0.56.0)

---
updated-dependencies:
- dependency-name: solargraph
  dependency-version: 0.56.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -546,7 +546,7 @@ GEM
       rack-protection (= 3.2.0)
       sinatra (= 3.2.0)
       tilt (~> 2.0)
-    solargraph (0.55.4)
+    solargraph (0.56.0)
       backport (~> 1.2)
       benchmark (~> 0.4)
       bundler (~> 2.0)
@@ -558,6 +558,7 @@ GEM
       observer (~> 0.1)
       ostruct (~> 0.6)
       parser (~> 3.0)
+      prism (~> 1.4)
       rbs (~> 3.3)
       reverse_markdown (~> 3.0)
       rubocop (~> 1.38)