Update conda index command (#234)

* See also python-control/python-control#981

Merge pull request #195 from bnavigator/slicot-update

Update SLICOT to 5.8 Update 1

Merge pull request #189 from bnavigator/fix-f2py-mod

remove -m argument from f2py .pyf generation

Merge pull request #184 from bnavigator/drop-py37

Drop support for Python 3.7

Merge pull request #182 from bnavigator/py311

Support Python 3.11

Merge pull request #178 from python-control/no-np1.23

Work around numpy/numpy#21889

slycot version 0.4.0

slycot version 0.3.5

slycot version 0.3.4

Release v0.3.3 of Slycot

This release of the Slycot library contains a working conda build process
plus fixes to the TD04AD function (including fixes issues with edge cases).
The README.rst file has also been updated to reflect the current build
process. See PR #26, PR #27 (based on PR #25), and PR #28 for details.