COBYLA minimiser accepting simple bounds constraints since scipy 1.11.0

[thehrh]

• source: release notes https://github.com/scipy/scipy/releases/tag/v1.11.0 and scipy/scipy@527263b.
• if we required scipy >= 1.11.0, we could get rid of the distinction in

  pisa/pisa/analysis/analysis.py

  Line 62 in 95eadf3

  MINIMIZERS_USING_CONSTRAINTS = ('cobyla')

  and the extra logic of

  pisa/pisa/analysis/analysis.py

  Line 1728 in 95eadf3

  if minimizer_method in MINIMIZERS_USING_CONSTRAINTS:

[thehrh]

#841 does the above implementation of bounds as constraints only when a lower scipy version is detected. In the future, once we update scipy, this should be removable.