build(deps): bump golang from 1.16.5-alpine3.13 to 1.16.6-alpine3.13

Bumps golang from 1.16.5-alpine3.13 to 1.16.6-alpine3.13.

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

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