Golang os/exec: LookPath bug: incorrect expansion of "", "." and ".." in some PATH configurations [1.24 backport]

@neild requested issue #74466 to be considered for backport to the next 1.24 minor release.

@gopherbot please create backport issues. This is a PUBLIC track security issue.

Comment From: gopherbot

Change https://go.dev/cl/691875 mentions this issue: [release-branch.go1.24] os/exec: fix incorrect expansion of "", "." and ".." in LookPath

Comment From: gopherbot

Closed by merging CL 691875 (commit 0f5133b742bf61cda6c98b4cd1d313a330f13f32) to release-branch.go1.24.