Use preferred tile.openstreetmap.org URL

[danieldegroot2]

See openstreetmap/operations#737

Use https://tile.openstreetmap.org/ (Change from HTTP to HTTPS, no {s}./a./...) in all repositories for your organization.
Change regular www.openstreetmap.org/... URLs also preferably from HTTP to HTTPS.

[jteresco]

Our OSM tiles are accessed through leaflet-providers. Looks like I should update our version of that and hopefully that will have TM and METAL use the proper OSM tile URLs in all cases.