[openstreetmap/openstreetmap-website] Add and unignore `.ruby-version` file to ensure consistent dev Ruby (PR #6333)

[Anton Khorev]

AntonKhorev left a comment (openstreetmap/openstreetmap-website#6333)

> Adds and unignores .ruby-version file to ensure a consistent development Ruby for all contributors.

Why do we need a consistent Ruby if we're supporting a range of versions?

> Doing so also helps push contributors onto newer rubies which can sometimes be quite helpful, such as with the latest [Ruby 3.4.5](https://www.ruby-lang.org/en/news/2025/07/15/ruby-3-4-5-released/) which addressed a ton of GCC 15 gem compilation error issues.

Why do I need to get pushed onto this version when I'm writing 3.2-compatible code?

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