Bump node from 15.8.0-alpine to 15.11.0-alpine (#805)

Bumps node from 15.8.0-alpine to 15.11.0-alpine.

Signed-off-by: dependabot[bot] <support@github.com>

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:15.8.0-alpine@sha256:db3f9c88223ba2491e7d2846a18efe46ecb4b60bf2bcf4b53cdcd39e5f6888b5
+FROM node:15.11.0-alpine@sha256:c01b5723b62c031744743b9641cad56b41b1d93fadee897443a5d7cca744bb5f
 ARG NODE_ENV=production
 ENV NODE_ENV=${NODE_ENV}
 LABEL "repository"="https://github.com/toolmantim/release-drafter"