Sync pexpect 4.6.0-4 (main) from Debian unstable (main)

[Lukas Märdian]

Please sync pexpect 4.6.0-4 (main) from Debian unstable (main)

Explanation of the Ubuntu delta and why it can be dropped:
  * There is no Ubuntu delta
  * Fix was applied upstream by the Debian maintainer.

Changelog entries since current groovy version 4.6.0-3:

pexpect (4.6.0-4) unstable; urgency=medium

  [ Lukas Märdian ]
  * Switch to Sphinx logging API to fix ftbfs; Closes: #955082
    - Apply fix from unbundled upstream package "sphinxcontrib_github_alt":
      1f1036514578016297f5f77e706fc91b2401bcf3

 -- Tobias Hansen <email address hidden> Sun, 30 Aug 2020 11:42:49 +0200

[Original Description]
FTBFS with Sphinx >= 3.x

Sphinx 3.x deprecated the "Sphinx.info()" API, it was replaced by the "sphinx.util.logging.getLogger" API.

Upstream adopted accordingly:
https://github.com/jupyter/sphinxcontrib_github_alt/commit/1f1036514578016297f5f77e706fc91b2401bcf3

A port of the upstream patch for pexpect 4.6.0 was proposed for merging into Debian:
https://salsa.debian.org/python-team/modules/pexpect/-/merge_requests/2

[Christian Ehrhardt  (paelzer)]

Checked, the delta really is only the change mentioned in the changelog.
Not a problem for the FF, synced the package.