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bitflags releases a major version, but we use it in the public interface, so upgrading is a breaking change. However, the bitflags changelog provides guidance on how to keep 2 mostly compatible with 1: https://github.com/bitflags/bitflags/blob/main/CHANGELOG.md#200
This is not perfect, there is still some chance of breaking dependents, but I think/hope it is OK. I think it's better than sticking with 1 only or bumping pcsc major.
The MSRV is bumped to match bitflags.