Bump yard from 0.9.40 to 0.9.42

Bumps [yard](https://yardoc.org) from 0.9.40 to 0.9.42.

---
updated-dependencies:
- dependency-name: yard
  dependency-version: 0.9.42
  dependency-type: indirect
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -109,7 +109,7 @@ GEM
     tsort (0.2.0)
     unicode-display_width (2.6.0)
     webrick (1.9.2)
-    yard (0.9.40)
+    yard (0.9.42)
     yard-coderay (0.1.0)
       coderay
       yard