[SCIP] SCIP Optimization Suite 9.1.1

[Stefan Vigerske]

Hi,

version 9.1.1 of the suite has been released, which brings the following 
bugfix releases:
- GCG 3.6.3    https://github.com/scipopt/gcg/blob/v36-bugfix/CHANGELOG
- PaPILO 2.3.1 https://github.com/scipopt/papilo/releases/tag/v2.3.1
- SCIP 9.1.1   https://scipopt.org/doc-9.1.1/html/RN9.php
- SoPlex 7.1.1 https://soplex.zib.de/doc-7.1.1/html/CHANGELOG.php
- ZIMPL 3.6.2  https://github.com/scipopt/zimpl/blob/master/CHANGELOG

Enjoy,
Stefan