Update index.rst #1300

Job	Run time
download_caravel	1m 42s
download_deps (pdk-with-volare)	3m 40s
download_deps (install_mcw)	4m 46s
download_deps (openlane)	1m 15s
download_deps (setup-timing-scripts)	44s
download_deps (precheck)	3m 7s
hardening (sky130A)	1h 27m 3s
hardening (sky130B)	54m 26s
RTL-verification (sky130A)	3m 50s
RTL-verification (sky130B)	4m 8s
STA (sky130A)	8m 34s
precheck (sky130A)	37m 13s
precheck (sky130B)	26m 4s
	3h 56m 32s

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