Bump jackson.version from 2.7.4 to 2.12.1 in /mio-parent#7

dependabot[bot] wants to merge 1 commit intomasterMiofly/Java:masterfrom

dependabot/maven/mio-parent/jackson.version-2.12.1Miofly/Java:dependabot/maven/mio-parent/jackson.version-2.12.1Copy head branch name to clipboard