fix(ci): drop coreutils from alpine job to match previous baseline

Busybox stat already supports `-c`, so installing coreutils is not
required. Removing it also avoids exposing 7 extra acceptance tests
that rely on a GNU environment and were previously skipped under
busybox, which caused the upgrade test to break on Alpine CI.

Author: Chemaclass

.github/workflows/tests.yml

@@ -194,7 +194,7 @@ jobs:
         run: |
           docker run --rm -v "$(pwd)":/project alpine:latest /bin/sh -c " \
             apk update && \
-            apk add --no-cache bash make git jq coreutils && \
+            apk add --no-cache bash make git jq && \
             adduser -D builder && \
             chown -R builder /project && \
             su - builder -c 'cd /project; ${{ matrix.command }}';"