fix(deps): bump node from 15.5.1 to 15.6.0 in /share/docker

Bumps node from 15.5.1 to 15.6.0.

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

share/docker/Dockerfile

@@ -1,4 +1,4 @@
-FROM node:15.5.1 AS node
+FROM node:15.6.0 AS node
 
 # Install base utils
 RUN set -x \