Merge pull request #2285 from ruby/dependabot/bundler/stringio-3.1.5

Bump stringio from 3.1.2 to 3.1.5

Author: soutaro

Gemfile.lock

@@ -144,7 +144,7 @@ GEM
       strscan (>= 1.0.0)
       terminal-table (>= 2, < 4)
       uri (>= 0.12.0)
-    stringio (3.1.2)
+    stringio (3.1.5)
     strong_json (2.1.2)
     strscan (3.1.2)
     tempfile (0.3.1)