Having been through this a number of times, I would recommend including the version number in the catalog filename.
We are currently on Lightroom Classic 9, and someday (we hope) there will be a Lightroom Classic 10. If the catalog is currently named “Lightroom Catalog”, then when the new version comes out, it will require a mandatory catalog format upgrade which will probably rename the catalog to “Lightroom Catalog-2”, and that’s where the confusion starts: It’s not clear if that is a v9 or v10 catalog, and not clear whether it’s the master or an accidental or unwanted copy. And if that default filename is never changed, it doesn’t set you up very well for future upgrades: The upgrade to version 11 will result in a mandatory upgrade copy confusingly named “Lightroom Catalog-2-2”.
Instead I name it something like “Lightroom Catalog v9” then on upgrade it will be renamed to “Lightroom Catalog v9-2”, which I will immediately rename (along with its preview and helper .lrdata files) to “Lightroom Catalog v10”. That just keeps things clear for me, but you can of course use whatever strategy is the least confusing for you in the long run.
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