Merge pull request #2525 from ruby/dependabot/bundler/steep/base64-0.3.0

Bump base64 from 0.2.0 to 0.3.0 in /steep

Author: soutaro

steep/Gemfile.lock

@@ -15,7 +15,7 @@ GEM
       tzinfo (~> 2.0, >= 2.0.5)
       uri (>= 0.13.1)
     ast (2.4.3)
-    base64 (0.2.0)
+    base64 (0.3.0)
     benchmark (0.4.0)
     bigdecimal (3.1.9)
     concurrent-ruby (1.3.5)