[openstreetmap/openstreetmap-website] Remove kgio gem (PR #6384)

[rkoeze]

### Description
The kgio gem was added [in this commit](https://github.com/openstreetmap/openstreetmap-website/commit/255b0b94252b48a9fe4326bb9d9fc4f184308460) as a dependency of dalli. However, [dalli no longer needs it](https://github.com/petergoldstein/dalli/blob/c6d85e4e4b440b22bf4a784eca77b234798553e5/3.0-Upgrade.md?plain=1#L17). See [this PR](https://github.com/petergoldstein/dalli/pull/721) for removal.

### How has this been tested?
I was able to build and run the app locally.  The tests pass.

You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/6384

-- Commit Summary --

  * Remove kgio gem

-- File Changes --

    M Gemfile (1)
    M Gemfile.lock (2)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/6384.patch
https://github.com/openstreetmap/openstreetmap-website/pull/6384.diff

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