[Security] Bump vaadin.version from 7.7.17 to 7.7.26#47

dependabot-preview[bot] wants to merge 1 commit intomasterhd42/linkki:masterfrom

dependabot/maven/vaadin.version-7.7.26hd42/linkki:dependabot/maven/vaadin.version-7.7.26Copy head branch name to clipboard