[3.13] gh-119185: Fix typo in `_pyrepl.pager`: `tempfilepager` should be `tempfile_pager` (GH-118881) (#119211)

Fix typo in `_pyrepl.pager`: `tempfilepager` should be `tempfile_pager`

The name with no underscore doesn't exist.
(cherry picked from commit 05e1dce76d7669e90ab73e7e682360d83b8a0d02)

Co-authored-by: Thanos <111999343+Sachaa-Thanasius@users.noreply.github.com>