Bump snakeyaml from 1.28 to 1.31 in /robot-core

[dependabot[bot]]

Bumps snakeyaml from 1.28 to 1.31.

Commits

• a3e641b Remove unused code for comments
• d2ed568 Remove unused code
• ab76f86 Add @​Deprecated annotation to constructs marked with @​deprecated javadoc.
• bc7869b Make billionLaughsAttackTest.billionLaughsAttackExpanded() robust
• 4cfb7b7 Merged in make-billion-laughs-attack-test-robust (pull request #7)
• da5ba16 Update changes.xml
• 23fbcef add test with JavaBean property of parameterized Collection
• 6385279 change how we set detected type to JavaBean Collection property item
• 0468784 force keyNode to be String for JavaBeans
• 467bcc9 expect node to be scalar when enforcings String keys
• Additional commits viewable in compare view

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