build: bump golang from 1.20.12 to 1.21.5

dependabot[bot] · web-flow · commit 7a0fe178766a · 2023-12-19T11:46:04.000Z
Bumps golang from 1.20.12 to 1.21.5.

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

Signed-off-by: dependabot[bot] &lt;support@github.com&gt;
diff --git a/Dockerfile.alpine b/Dockerfile.alpine
@@ -1,7 +1,7 @@
 ARG DOCKER_GEN_VERSION=main
 
 # Build docker-gen from scratch
-FROM golang:1.20.12-alpine as go-builder
+FROM golang:1.21.5-alpine as go-builder
 
 ARG DOCKER_GEN_VERSION
 WORKDIR /build
diff --git a/Dockerfile.debian b/Dockerfile.debian
@@ -1,7 +1,7 @@
 ARG DOCKER_GEN_VERSION=main
 
 # Build docker-gen from scratch
-FROM golang:1.20.12 as go-builder
+FROM golang:1.21.5 as go-builder
 
 ARG DOCKER_GEN_VERSION
 
