[BUG] makeHighContrastColor warns that it cannot make good colors for typeahead/_suggestion.scss

[AMoo-Miki]

Describe the bug

   │ warn worker stderr WARNING: High enough contrast could not be determined. Most likely your background color does not adjust for dark mode.
   │ warn worker stderr          on line 128 of node_modules/@elastic/eui/src/themes/eui-next/global_styling/functions/_colors.scss, in function `makeHighContrastColor`
   │ warn worker stderr          from line 105 of src/plugins/data/public/ui/typeahead/_suggestion.scss
   │ warn worker stderr          from line 1 of src/plugins/data/public/ui/typeahead/_index.scss
   │ warn worker stderr          from line 2 of src/plugins/data/public/ui/_index.scss
   │ warn worker stderr          from line 2 of src/plugins/data/public/index.scss

[BSFishy]

OpenSearch-Dashboards/src/plugins/data/public/ui/typeahead/_suggestion.scss

Line 105 in 8e1ec99

color: makeHighContrastColor($color, tintOrShade($color, 90%, 50%));

Changing 50% even to 51% fixes the issue