Bump snakeyaml from 1.30 to 1.31 in /core

Bumps [snakeyaml](https://bitbucket.org/snakeyaml/snakeyaml) from 1.30 to 1.31.
- [Commits](https://bitbucket.org/snakeyaml/snakeyaml/branches/compare/snakeyaml-1.31..snakeyaml-1.30)

---
updated-dependencies:
- dependency-name: org.yaml:snakeyaml
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

core/build.gradle

@@ -80,7 +80,7 @@ dependencies {
 
     api 'com.github.docker-java:docker-java-transport-zerodep'
 
-    shaded "org.yaml:snakeyaml:1.30"
+    shaded "org.yaml:snakeyaml:1.31"
 
     shaded 'org.glassfish.main.external:trilead-ssh2-repackaged:4.1.2'