chore(deps): bump golang from 1.20.5-alpine to 1.21.1-alpine

Bumps golang from 1.20.5-alpine to 1.21.1-alpine.

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

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

Dockerfile

@@ -1,5 +1,5 @@
 # Base
-FROM golang:1.20.5-alpine AS builder
+FROM golang:1.21.1-alpine AS builder
 RUN apk add --no-cache build-base
 WORKDIR /app
 COPY . /app