build(deps): bump alpine from 3.20.3 to 3.21.2

Bumps alpine from 3.20.3 to 3.21.2.

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

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

Author: dependabot[bot]

Dockerfile

@@ -1,6 +1,6 @@
 FROM hashicorp/terraform:1.9.7 as terraform
 
-FROM alpine:3.20.3
+FROM alpine:3.21.2
 
 ENV COLLECTION_VERSION=5577707ce153198a2dacbdfc6baa8db349cac944
 ENV MONITORS_VERSION=v1.2.5