Bump solargraph from 0.47.0 to 0.47.2

Bumps [solargraph](https://github.com/castwide/solargraph) from 0.47.0 to 0.47.2.
- [Release notes](https://github.com/castwide/solargraph/releases)
- [Changelog](https://github.com/castwide/solargraph/blob/master/CHANGELOG.md)
- [Commits](https://github.com/castwide/solargraph/compare/v0.47.0...v0.47.2)

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

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

Gemfile.lock

@@ -227,7 +227,7 @@ GEM
     rb-inotify (0.10.1)
       ffi (~> 1.0)
     ref (2.0.0)
-    regexp_parser (2.5.0)
+    regexp_parser (2.6.0)
     reverse_markdown (2.1.1)
       nokogiri
     rexml (3.2.5)
@@ -267,7 +267,7 @@ GEM
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
     smart_properties (1.17.0)
-    solargraph (0.47.0)
+    solargraph (0.47.2)
       backport (~> 1.2)
       benchmark
       bundler (>= 1.17.2)