Bump golang from 1.20.6 to 1.21.1 (#52)

Bumps golang from 1.20.6 to 1.21.1.

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

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 golang:1.20.6 as build
+FROM golang:1.21.1 as build
 RUN apt-get update; apt-get install ca-certificates -y
 WORKDIR /src
 ADD go.mod go.sum /src/