build(deps): bump alpine from 3.20.3 to 3.21.0 (#782)

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
...

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

Dockerfile

@@ -29,7 +29,7 @@ RUN go generate buildinfo/buildinfo.go
 RUN go build -o wg-access-server
 
 ### Server
-FROM alpine:3.20.3
+FROM alpine:3.21.0
 RUN apk add --no-cache iptables ip6tables wireguard-tools curl
 ENV WG_CONFIG="/config.yaml"
 ENV WG_STORAGE="sqlite3:///data/db.sqlite3"