[Slider] Hide mark labels to screen readers

[Patil2099]

Fixes #16921

[mui-pr-bot]

Details of bundle changes.

Comparing: 3d973a2...dba5476

bundle	parsed diff	gzip diff	prev parsed	current parsed	prev gzip	current gzip
@material-ui/core	+0.01% 🔺	-0.00%	329,139	329,156	90,010	90,008
@material-ui/core/Paper	0.00%	0.00%	68,843	68,843	20,523	20,523
@material-ui/core/Paper.esm	0.00%	0.00%	62,217	62,217	19,249	19,249
@material-ui/core/Popper	0.00%	0.00%	28,468	28,468	10,177	10,177
@material-ui/core/Textarea	0.00%	0.00%	5,094	5,094	2,135	2,135
@material-ui/core/TrapFocus	0.00%	0.00%	3,834	3,834	1,614	1,614
@material-ui/core/styles/createMuiTheme	0.00%	0.00%	16,386	16,386	5,826	5,826
@material-ui/core/useMediaQuery	0.00%	0.00%	2,541	2,541	1,059	1,059
@material-ui/lab	+0.01% 🔺	+0.01% 🔺	153,172	153,189	46,726	46,732
@material-ui/styles	0.00%	0.00%	51,561	51,561	15,339	15,339
@material-ui/system	0.00%	0.00%	15,658	15,658	4,360	4,360
Button	0.00%	0.00%	78,847	78,847	24,093	24,093
Modal	0.00%	0.00%	14,346	14,346	5,011	5,011
Portal	0.00%	0.00%	2,907	2,907	1,318	1,318
Rating	0.00%	0.00%	70,206	70,206	21,925	21,925
Slider	+0.02% 🔺	+0.03% 🔺	74,522	74,539	23,100	23,108
colorManipulator	0.00%	0.00%	3,904	3,904	1,543	1,543
docs.landing	0.00%	0.00%	53,311	53,311	13,786	13,786
docs.main	0.00%	0.00%	599,106	599,106	191,143	191,143
packages/material-ui/build/umd/material-ui.production.min.js	+0.01% 🔺	+0.01% 🔺	300,130	300,147	86,386	86,394

Generated by 🚫 dangerJS against dba5476