Add libgirepository1.0-dev as a build dependency

I assume this package was pulled in by something else at some point in time but right now it is not

in latest debian testing it fails to build

Dependency lookup for gobject-introspection-1.0 with method 'cmake' failed: CMake binary for machine 1 not found. Giving up. Run-time dependency gobject-introspection-1.0 found: NO (tried pkgconfig)

../src/meson.build:366:20: ERROR: Dependency "gobject-introspection-1.0" not found, tried pkgconfig dh_auto_configure: error: cd obj-aarch64-linux-gnu && DEB_PYTHON_INSTALL_LAYOUT=deb LC_ALL=C.UTF-8 meson setup .. --wrap-mode=nodownload --buildtype=plain --prefix=/usr --sysconfdir=/etc --localstatedir=/var --libdir=lib/aarch64-linux-gnu -Dpython.bytecompile=-1 -Dphoc_tests=disabled -Dsystemd=true -Dgtk_doc=true -Dman=true -Dtests=true returned exit code 1