Bump ajv from 6.12.2 to 6.12.6 in /packages/react-tree#13

dependabot[bot] wants to merge 1 commit intomastermpkelly/react-tree:masterfrom

dependabot/npm_and_yarn/packages/react-tree/ajv-6.12.6mpkelly/react-tree:dependabot/npm_and_yarn/packages/react-tree/ajv-6.12.6Copy head branch name to clipboard