[openstreetmap/openstreetmap-website] Update to rack 3 (PR #5923)

[Anton Khorev]

AntonKhorev left a comment (openstreetmap/openstreetmap-website#5923)

`headers` here
https://github.com/openstreetmap/openstreetmap-website/blob/fd7b428007905463e2359ed0823920954c699375/config/initializers/cors.rb#L9

were `Rack::Utils::HeaderHash` before and became `Hash` after this PR.

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