* rivet: add version 3.1.11 with some back-port fixes
Some back-ported fixes from the 4.x series. Most importantly the
possibility to build against HepMC 3.3.0.
* yoda: Add version 1.9.11
* Add a conflict with hepmc=2
* Unify hepmc@3.3.0 conflicts into one statement
* Remove conflict and update conditional hepmc variant
* Use caret to signify conflict with dependency
Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>
* Make conflict and msg more specific
* Add dedicated version dependency to yoda
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Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>
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