Fix CI: install libgirepository-2.0-dev required by newer PyGObject b…

[anhtumai]

…uilds

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[anhtumai]

@Davidy22 this PR should unblock the CI pipeline: https://github.com/Guake/guake/actions/runs/28706200405/job/85132147751 , which fails with:

../meson.build:35:9: ERROR: Dependency 'girepository-2.0' is required but not found.

Can you run this pipeline to test: https://github.com/Guake/guake/actions/runs/30938832362