Bump golang from 1.21.6-alpine3.18 to 1.22.0-alpine3.18 in /docker

Bumps golang from 1.21.6-alpine3.18 to 1.22.0-alpine3.18.

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

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

docker/Dockerfile

@@ -1,6 +1,6 @@
 # syntax=docker/dockerfile:1
 
-FROM golang:1.21.6-alpine3.18 AS build
+FROM golang:1.22.0-alpine3.18 AS build
 WORKDIR /app
 ARG VERSION_FLAGS=-ldflags=