chore(deps): bump acorn-walk from 6.1.1 to 6.2.0

Bumps [acorn-walk](https://github.com/acornjs/acorn) from 6.1.1 to 6.2.0.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@6.1.1...6.2.0)

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

yarn.lock

@@ -1131,9 +1131,9 @@ acorn-jsx@^5.0.0:
   integrity sha512-HJ7CfNHrfJLlNTzIEUTj43LNWGkqpRLxm3YjAlcD0ACydk9XynzYsCBHxut+iqt+1aBXkx9UP/w/ZqMr13XIzg==
 
 acorn-walk@^6.0.1:
-  version "6.1.1"
-  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.1.1.tgz#d363b66f5fac5f018ff9c3a1e7b6f8e310cc3913"
-  integrity sha512-OtUw6JUTgxA2QoqqmrmQ7F2NYqiBPi/L2jqHyFtllhOUvXYQXf0Z1CYUinIfyT4bTCGmrA7gX9FvHA81uzCoVw==
+  version "6.2.0"
+  resolved "https://registry.yarnpkg.com/acorn-walk/-/acorn-walk-6.2.0.tgz#123cb8f3b84c2171f1f7fb252615b1c78a6b1a8c"
+  integrity sha512-7evsyfH1cLOCdAzZAd43Cic04yKydNx0cF+7tiA19p1XnLLPU4dpCQOqpjqwokFe//vS0QqfqqjCS2JkiIs0cA==
 
 acorn@^5.5.3:
   version "5.7.3"