MNT: Bump ABI 1.7

Paul McCarthyrequested to merge
mnt/v1.7 into main

The libxmlpp changes are not ABI-compatible, due to the removal of glibmm/etc. On macOS, executables must directly link against the ciftilib dependencies, even though they are not used directly. So this means that e.g. flameo was complaining about not being able to find libglibmm.so.

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