Because no versions of open_street_map_search_and_pick match >0.1.0 <0.2.0 and open_street_map_search_and_pick 0.1.0 depends on http ^0.13.5, open_street_map_search_and_pick ^0.1.0 requires http ^0.13.5.
And because google_fonts >=4.0.5 depends on http ^1.0.0, open_street_map_search_and_pick ^0.1.0 is incompatible with google_fonts >=4.0.5.
So, because dating depends on both google_fonts 5.1.0 and open_street_map_search_and_pick ^0.1.0, version solving failed.
Because no versions of open_street_map_search_and_pick match >0.1.0 <0.2.0 and open_street_map_search_and_pick 0.1.0 depends on http ^0.13.5, open_street_map_search_and_pick ^0.1.0 requires http ^0.13.5. And because google_fonts >=4.0.5 depends on http ^1.0.0, open_street_map_search_and_pick ^0.1.0 is incompatible with google_fonts >=4.0.5. So, because dating depends on both google_fonts 5.1.0 and open_street_map_search_and_pick ^0.1.0, version solving failed.