Bump alpine from 3.18 to 3.19

Bumps alpine from 3.18 to 3.19.

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

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

Dockerfile

@@ -6,7 +6,7 @@
 # in the Python Docker image we use for the build-stage. The tag of the Python
 # Docker image matches the version of the python3 package available on Alpine
 # for consistency.
-FROM alpine:3.18 AS compile-stage
+FROM alpine:3.19 AS compile-stage
 
 # Unprivileged user information necessary for the Python virtual environment
 ARG CISA_USER="cisa"