build(deps): bump golang from 1.16.7-alpine to 1.16.8-alpine

Bumps golang from 1.16.7-alpine to 1.16.8-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Dockerfile

@@ -1,6 +1,6 @@
 # syntax = docker/dockerfile:1.2
 
-FROM golang:1.16.7-alpine AS build
+FROM golang:1.16.8-alpine AS build
 WORKDIR /src
 RUN apk add --no-cache file
 ENV GOMODCACHE /root/.cache/gocache