deps(docker): bump alpine from 3.20.3 to 3.21.0 (#419)

Bumps alpine from 3.20.3 to 3.21.0.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Dockerfile

@@ -24,7 +24,7 @@ RUN go mod download && \
 
 
 # get alpine container
-FROM alpine:3.20.3 AS app
+FROM alpine:3.21.0 AS app
 
 # create workdir
 WORKDIR /opt/app