build: Updating npm dependencies

* eslint-config-wikimedia: 0.25.1 → 0.26.0
* grunt-eslint: 24.0.1 → 24.3.0

Change-Id: I4eae2233515c9c20e2476ed564af654713b570db
Reviewed-on: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/CSS/+/999071
Reviewed-by: Libraryupgrader <tools.libraryupgrader@tools.wmflabs.org>
Tested-by: jenkins-bot
2 files changed