Sync ipykernel 4.9.0-2 (universe) from Debian unstable (main)

Please sync ipykernel 4.9.0-2 (universe) from Debian unstable (main)

Explanation of the Ubuntu delta and why it can be dropped:
  * Drop build-dependency on removed python-path.
  * Drop build-dependency on removed python-path.

The build-dependency has been dropped in the Debian package too.

Changelog entries since current focal version 4.9.0-1ubuntu1:

ipykernel (4.9.0-2) unstable; urgency=medium

  [ Gordon Ball ]
  * Drop build-depends on python{,3}-path (from 4.9.0-1ubuntu1)
  * Declare Rules-Requires-Root: no
  * Update Standards-Version to 4.4.0
  * Update debhelper compat level to 12

  [ Ondřej Nový ]
  * Use debhelper-compat instead of debian/compat.

 -- Gordon Ball <email address hidden> Wed, 09 Oct 2019 18:06:42 +0000