build: Bump fwupd dependency to 1.2.7
In commit 28dd972a, fwupd_release_get_categories() was called. While this is an API introced in fwupd 1.2.7. So bump the fwupd dependency accordingly.
In commit 28dd972a, fwupd_release_get_categories() was called. While this is an API introced in fwupd 1.2.7. So bump the fwupd dependency accordingly.