Improve the Kotlin language color + match modern branding (#5383)
Improve the Kotlin language color + match modern branding (#5383)

* Improve the Kotlin language color

The previous color no longer matches the kotlin branding colors and hasn't aged well. This matches the newer branding

* Update to recommended value

Co-authored-by: Colin Seymour <342564bc1ab1e55103f85104b5e013adfdf828cb@github.com>
github/linguist,erkyrath/linguist,erkyrath/linguist,christop/linguist,erkyrath/linguist,github/linguist,github/linguist,github/linguist,erkyrath/linguist,christop/linguist