tests: Skip MemoryMonitor test if GObject-Introspection is too old

Merged Simon McVittie requested to merge wip/smcv/skip-low-mem into master

Distributions will likely want to update GLib before GObject-Introspection, to avoid circular dependencies.

At least, we want to do it in that order in Debian (also partly because GLib has had a stable release this cycle, and GObject-Introspection hasn't yet).

Edited by Simon McVittie

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