[openstreetmap/openstreetmap-website] add "gem update --system" before bundle install (#2419)

[Cheng Yi]

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

  https://github.com/openstreetmap/openstreetmap-website/pull/2419

-- Commit Summary --

  * add "gem update --system" before bundle install

-- File Changes --

    M INSTALL.md (1)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/2419.patch
https://github.com/openstreetmap/openstreetmap-website/pull/2419.diff

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