fix(Divider, Menu): replacing the gray12 from variables to gray08

[mnajdova]

Fix

The gray12 was deleted from the siteVariables which broke the look of the components using this color, as it was undefined. This was now replaced with gray08.

The components affected by this were the Divider (the border color for the default Divider) and the Menu (the bottom border color of the underined Menu).

[codecov]

Codecov Report

Merging #200 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #200   +/-   ##
=======================================
  Coverage   67.69%   67.69%           
=======================================
  Files         103      103           
  Lines        1461     1461           
  Branches      288      288           
=======================================
  Hits          989      989           
  Misses        468      468           
  Partials        4        4

Impacted Files	Coverage Δ
src/themes/teams/components/Menu/menuVariables.ts	50% <ø> (ø)	⬆️
...hemes/teams/components/Divider/dividerVariables.ts	50% <ø> (ø)	⬆️

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