Chore: Set min node version in package.json to 16 (#41423)

* Update package.json

* Update build-container version

* Sign drone

* Update developer-guide

* kick drone

Co-authored-by: dsotirakis <sotirakis.dim@gmail.com>
Co-authored-by: Dimitris Sotirakis <dimitrios.sotirakis@grafana.com>
Co-authored-by: kay delaney <kay@grafana.com>

scripts/drone/steps/lib.star

@@ -1,7 +1,7 @@
 load('scripts/drone/vault.star', 'from_secret', 'github_token', 'pull_secret', 'drone_token')
 
 grabpl_version = '2.5.5'
-build_image = 'grafana/build-container:1.4.4'
+build_image = 'grafana/build-container:1.4.5'
 publish_image = 'grafana/grafana-ci-deploy:1.3.1'
 grafana_docker_image = 'grafana/drone-grafana-docker:0.3.2'
 deploy_docker_image = 'us.gcr.io/kubernetes-dev/drone/plugins/deploy-image'