Bug#986755: unblock: please unblock what-is-python

[Matthias Klose <doko@debian.org>]

Package: release.debian.org
Severity: normal
User: release.debian.org@packages.debian.org
Usertags: unblock

please unblock what-is-python.

  * Update package descriptions for the Debian 11 (bullseye) release.
  * Bump package versions and provides.
  * Provide pdb symlinks in the -dev packages.
  * Also provide symlinks to the manual pages for all packages.

There are no code changes, the package is a dependency package.

The python-is-python3 and python-dev-is-python3 are now provided in version
3.9.x, instead of 3.8.x to match what is shipped with bullseye.