Merge pull request #2340 from ruby/dependabot/bundler/steep/ast-2.4.3

Bump ast from 2.4.2 to 2.4.3 in /steep

Author: soutaro

steep/Gemfile.lock

@@ -14,7 +14,7 @@ GEM
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
       uri (>= 0.13.1)
-    ast (2.4.2)
+    ast (2.4.3)
     base64 (0.2.0)
     benchmark (0.4.0)
     bigdecimal (3.1.9)