feat: add node16 support (#922)

* feat: add node16 support

Signed-off-by: hackercat <me@hackerc.at>

* feat: bump images to node16

Signed-off-by: hackercat <me@hackerc.at>

* lint(editorconfig): ignore *.md due to mixed style

Signed-off-by: hackercat <me@hackerc.at>

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

pkg/runner/testdata/actions/docker-url/action.yml

@@ -8,7 +8,7 @@ inputs:
     default: World
 runs:
   using: docker
-  image: docker://node:12-buster-slim
+  image: docker://node:16-buster-slim
   entrypoint: /bin/sh -c
   env:
     TEST: enabled