Bump library/alpine from 3.19.1 to 3.20.0 in /build/package

Bumps library/alpine from 3.19.1 to 3.20.0.

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

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

build/package/Dockerfile.alpine

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: MIT
 # https://hub.docker.com/_/alpine
-FROM docker.io/library/alpine:3.19.1
+FROM docker.io/library/alpine:3.20.0
 
 COPY semver /usr/local/bin/semver