*/*: Chase update of math/libqalculate

Bump PORTREVISION of math/libqalculate consumers after update to 5.0.0.
According to the release notes [1], libqalculate 5.x is not ABI
compatibile with previous versions and rebuilding of consumers is
required.

[1] https://github.com/Qalculate/libqalculate/releases/tag/v5.0.0