chore(deps): bump golang from 1.15.10 to 1.16.5

Bumps golang from 1.15.10 to 1.16.5.

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

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

Dockerfile

@@ -3,7 +3,7 @@ ARG DOCKER_GEN_VERSION=0.7.6
 ARG FOREGO_VERSION=v0.17.0
 
 # Use a specific version of golang to build both binaries
-FROM golang:1.15.10 as gobuilder
+FROM golang:1.16.5 as gobuilder
 
 # Build docker-gen from scratch
 FROM gobuilder as dockergen

Dockerfile.alpine

@@ -3,7 +3,7 @@ ARG DOCKER_GEN_VERSION=0.7.6
 ARG FOREGO_VERSION=v0.17.0
 
 # Use a specific version of golang to build both binaries
-FROM golang:1.15.10-alpine as gobuilder
+FROM golang:1.16.5-alpine as gobuilder
 RUN apk add --no-cache git musl-dev
 
 # Build docker-gen from scratch