Darken table border-color
Darken table border-color

Fixes #25016 which noticed a .thead-light and border-color of the .table-border are the same color.

inway/bootstrap,bootstrapbrasil/bootstrap,zalog/bootstrap,kvlsrg/bootstrap,gijsbotje/bootstrap,zalog/bootstrap,Lyricalz/bootstrap,vsn4ik/bootstrap,9-chirno/chirno,tagliala/bootstrap,tagliala/bootstrap,Lyricalz/bootstrap,bardiharborow/bootstrap,seanwu99/bootstrap,coliff/bootstrap,janseliger/bootstrap,bardiharborow/bootstrap,supergibbs/bootstrap,fschumann1211/bootstrap,gijsbotje/bootstrap,kvlsrg/bootstrap,vsn4ik/bootstrap,vsn4ik/bootstrap,supergibbs/bootstrap,m5o/bootstrap,yuyokk/bootstrap,Hemphill/bootstrap-docs,gijsbotje/bootstrap,janseliger/bootstrap,seanwu99/bootstrap,GerHobbelt/bootstrap,zalog/bootstrap,janseliger/bootstrap,Hemphill/bootstrap-docs,joblocal/bootstrap,m5o/bootstrap,nice-fungal/bootstrap,Lyricalz/bootstrap,stanwmusic/bootstrap,9-chirno/chirno,kvlsrg/bootstrap,bootstrapbrasil/bootstrap,fschumann1211/bootstrap,yuyokk/bootstrap,stanwmusic/bootstrap,twbs/bootstrap,Hemphill/bootstrap-docs,creativewebjp/bootstrap,inway/bootstrap,Hemphill/bootstrap-docs,stanwmusic/bootstrap,tjkohli/bootstrap,SweetProcess/bootstrap,peterblazejewicz/bootstrap,fschumann1211/bootstrap,SweetProcess/bootstrap,9-chirno/chirno,creativewebjp/bootstrap,joblocal/bootstrap,tjkohli/bootstrap,creativewebjp/bootstrap,yuyokk/bootstrap,yuyokk/bootstrap,peterblazejewicz/bootstrap,stanwmusic/bootstrap,joblocal/bootstrap,SweetProcess/bootstrap,seanwu99/bootstrap,inway/bootstrap,bootstrapbrasil/bootstrap,janseliger/bootstrap,joblocal/bootstrap,bardiharborow/bootstrap,creativewebjp/bootstrap,tagliala/bootstrap,nice-fungal/bootstrap,vsn4ik/bootstrap,twbs/bootstrap,peterblazejewicz/bootstrap,GerHobbelt/bootstrap,seanwu99/bootstrap,nice-fungal/bootstrap,GerHobbelt/bootstrap,SweetProcess/bootstrap,gijsbotje/bootstrap,9-chirno/chirno,coliff/bootstrap,Lyricalz/bootstrap,supergibbs/bootstrap,supergibbs/bootstrap,bardiharborow/bootstrap,fschumann1211/bootstrap