[3.14] gh-140920: remove incorrect mentions to `concurrent.futures.interpreter.ExecutionFailed` (GH-141723) (#143315)

gh-140920: remove incorrect mentions to `concurrent.futures.interpreter.ExecutionFailed` (GH-141723)

Remove documentation for inexistant `concurrent.futures.interpreter.ExecutionFailed`
and replace its occurrences by `concurrent.interpreters.ExecutionFailed` since this
is the documented exception.
(cherry picked from commit c5215978ebfea9471f313d5baa70a4e68bfb798b)

Co-authored-by: Lakshya Upadhyaya <lakshya.upadhyaya05@gmail.com>