Bump golang from 1.16-alpine to 1.16.6-alpine

Bumps golang from 1.16-alpine to 1.16.6-alpine.

---
updated-dependencies:
- dependency-name: golang
  dependency-type: direct:production
...

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

Dockerfile

@@ -18,7 +18,7 @@ COPY assets ./assets
 # Do the build
 RUN yarn build
 
-FROM golang:1.16-alpine AS builder
+FROM golang:1.16.6-alpine AS builder
 
 RUN apk add --no-cache git ca-certificates
 RUN mkdir /dozzle