Bump golang from 1.19.0-bullseye to 1.20.4-bullseye

Bumps golang from 1.19.0-bullseye to 1.20.4-bullseye.

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

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19.0-bullseye as builder
+FROM golang:1.20.4-bullseye as builder
 WORKDIR /workspace
 
 ARG VERSION