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

[Tom Hughes]

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

I assume you're thinking about https://github.com/rack/rack/blob/main/UPGRADE-GUIDE.md#response-headers-must-be-lower-case which is technically about response headers though the same is essentially true for request headers.

I think the reason they don't mention request headers is that the `headers` object rack passes you is always a `Rack::Headers` object which does case insensitive lookups, so the case here shouldn't matter.

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