SpringBoot Update yaml_snakeyaml dependency on 2.7.x to fix vulnerability

Vulnerability critical CVE-2022-1471 associated to org.yaml_snakeyaml version 1.30. Fixed in version 1.31.

Version 2.7.6 of spring-boot still use version 1.30.

Comment From: bclozel

Duplicates #33457 Also see #32221 to better understand our upgrade policy and why we can’t upgrade in 2.7.x.