build(deps-dev): bump solargraph from 0.39.12 to 0.39.13 (cloudfoundry#1770)

Bumps [solargraph](https://github.com/castwide/solargraph) from 0.39.12 to 0.39.13.
- [Release notes](https://github.com/castwide/solargraph/releases)
- [Commits](https://github.com/castwide/solargraph/commits)

Signed-off-by: dependabot[bot] <support@github.com>

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

[finishes #174189324]

Author: dependabot[bot]

Gemfile.lock

@@ -429,7 +429,7 @@ GEM
       rack-protection (= 2.0.8.1)
       sinatra (= 2.0.8.1)
       tilt (~> 2.0)
-    solargraph (0.39.12)
+    solargraph (0.39.13)
       backport (~> 1.1)
       benchmark
       bundler (>= 1.17.2)