Bump golang from 1.21.5 to 1.22.2 in /.test-defs#8

dependabot[bot] wants to merge 1 commit intomasterScheererJ/gardener:masterfrom

dependabot/docker/dot-test-defs/golang-1.22.2ScheererJ/gardener:dependabot/docker/dot-test-defs/golang-1.22.2Copy head branch name to clipboard