chore(changeset): tell Alpine users that @cipherstash/auth loads on musl again

@cipherstash/auth-linux-x64-musl 0.44.0 linked glibc, so the package
did not load on musl systems such as Alpine Linux. #1018 fixes the
build. None of the six carried changesets says so, and AGENTS.md asks
for a changeset for a bug fix to a published package. It lives here
because main's lint:auth-changeset refuses any @cipherstash/auth
changeset until this PR removes the freeze. freshtonic raised it in
review of #1018.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PaY5xYydZUWhv8Nex9Sw8a

Author: auxesis

.changeset/auth-linux-x64-musl-links-musl.md

@@ -0,0 +1,6 @@
+---
+"@cipherstash/auth": patch
+---
+
+The `linux-x64-musl` binary now links musl. In 0.44.0 it linked glibc, so
+`@cipherstash/auth` did not load on musl systems such as Alpine Linux.