Bump snakeyaml from 1.26 to 1.27 (#4371)

Bumps [snakeyaml](https://bitbucket.org/asomov/snakeyaml) from 1.26 to 1.27.
- [Commits](https://bitbucket.org/asomov/snakeyaml/branches/compare/snakeyaml-1.27..snakeyaml-1.26)

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test-utils/build.gradle

@@ -1,5 +1,5 @@
 ext {
-    snakeYamlVersion = '1.26'
+    snakeYamlVersion = '1.27'
 }
 
 dependencies {