cre update fails with "invalid cross-device link" when /tmp and install dir are on different partitions

The cre update command fails to complete the update process because it attempts a rename operation across different device boundaries. This is a common issue when /tmp is mounted as a tmpfs or is on a separate partition from the user's home/installation directory.

Error Output:

Updating cre CLI...
Downloading: https://github.com/smartcontractkit/cre-cli/releases/download/v1.0.7/cre_linux_amd64.tar.gz
Error: failed to replace binary: rename /tmp/cre_update_3483520469/cre_v1.0.7_linux_amd64 /root/.cre/bin/cre: invalid cross-device link

Environment:

• OS: Debian (Linux)
• Version: upgrading from v1.0.6 to v1.0.7
• Install Path: /root/.cre/bin/cre

Suggested Fix: In the update logic, if os.Rename fails with an EXDEV error (invalid cross-device link), the tool should fall back to copying the file contents and then deleting the source, or use a temporary directory located on the same partition as the target binary.

Start at the cre update command's binary replacement logic and locate its os.Rename call. Reproduce the failure with /tmp and the installation directory on different partitions, then verify that the update completes without the cross-device-link error while preserving the existing replacement behavior.