Bump coffee-script-source to fix bug
Bump coffee-script-source to fix bug

Coffee script 1.12.1 was released and contained a bug where coffee
script was undefined. 1.12.1 was yanked and 1.12.2 was released. This
bumps coffee-script-source so that CI Railties tests pass.

See: https://github.com/jashkenas/coffeescript/issues/4403

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