ci: Fix code navigation job
Our code navigation CI job is currently broken, where we always get an Internal Server Error when uploading artifact created by lsif-go. As it turns out, this breakage is caused by an upstream change which has caused a change in the output format.
Fix the error by pinning the lsif-go version to v1.3.1, which is the most recent version which still works without issue.
Edited by Patrick Steinhardt