build: bump alpine from 3.21.1 to 3.21.2

Bumps alpine from 3.21.1 to 3.21.2.

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile.alpine

@@ -26,7 +26,7 @@ RUN set -eu; \
 	go build -ldflags "-X main.buildVersion=${FOREGO_VERSION}" -o forego .; \
 	go clean -cache
 
-FROM alpine:3.21.1
+FROM alpine:3.21.2
 
 ARG FOREGO_VERSION
 ENV FOREGO_VERSION=${FOREGO_VERSION}