add new intersphinx

[sappelhoff]

PR Description

closes #1134

Merge checklist

Maintainer, please confirm the following before merging.
If applicable:

• All comments are resolved
• This is not your own PR
• All CIs are happy
• PR title starts with [MRG]
• whats_new.rst is updated
• New contributors have been added to CITATION.cff
• PR description includes phrase "closes <#issue-number>"

[codecov]

Codecov Report

Merging #1135 (571205d) into main (772399d) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1135   +/-   ##
=======================================
  Coverage   95.28%   95.28%           
=======================================
  Files          40       40           
  Lines        8694     8694           
=======================================
  Hits         8284     8284           
  Misses        410      410           

[hoechenberger]

Thanks @sappelhoff