[Snyk] Security upgrade com.thoughtworks.xstream:xstream from 1.4.5 to 1.4.21#6

usgnim wants to merge 1 commit intomainusgnim/WebGoat:mainfrom

snyk-fix-88488e62c76071b6520029b6a51d4c5ausgnim/WebGoat:snyk-fix-88488e62c76071b6520029b6a51d4c5aCopy head branch name to clipboard