Bump alpine from 3.18 to 3.20 in /package

Bumps alpine from 3.18 to 3.20.

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

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 86875c97bb)
Signed-off-by: Brad Davidson <brad.davidson@rancher.com>

package/Dockerfile

@@ -1,4 +1,4 @@
-FROM alpine:3.18 as base
+FROM alpine:3.20 as base
 RUN apk add -U ca-certificates tar zstd tzdata
 COPY build/out/data.tar.zst /
 RUN mkdir -p /image/etc/ssl/certs /image/run /image/var/run /image/tmp /image/lib/modules /image/lib/firmware && \