asdf: match the fork's goreleaser asset naming

The fork's goreleaser archive name_template omits the version
(kube-credential-cache_Linux_x86_64.tar.gz), whereas download_release
built a versioned URL (..._${version}_...). That mismatch 404'd the
asdf install test once the download source pointed at the fork. Drop
the version segment so the URL matches the published assets.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01V2pTHkL3AmyFqgyQhgrohw

Author: claude

bin/scripts/utils.bash

@@ -43,7 +43,7 @@ download_release() {
   version="$1"
   filename="$2"
 
-  url="$GH_REPO/releases/download/v${version}/kube-credential-cache_${version}_$(uname -s)_$(uname -m).tar.gz"
+  url="$GH_REPO/releases/download/v${version}/kube-credential-cache_$(uname -s)_$(uname -m).tar.gz"
 
   echo "* Downloading $TOOL_NAME release $version..."
   curl "${curl_opts[@]}" -o "$filename" -C - "$url" || fail "Could not download $url"