build(deps): deal with changes in fmt's trunk #4114
Merged
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Bleeding edge CI test failures due to more changes in fmt's trunk. Solutions:
Accommodate some recent header refactoring in fmt.
Straighten up some const issues that worked before, but break under the latest fmt. Making the custom formatter's 'format' method be const fixes the latest, but breaks some of the oldest versions of fmt we support, so we add the const only from fmt 9.0 on.