Bump rocm-docs-core from 1.12.0 to 1.13.0 in /docs/sphinx #22171

Job	Run time
Check if image exists in registry	5s
pyflakes	5m 21s
licensing	4m 13s
cancel	3s
linux (ubuntu-20.04, debug)	2h 36m 11s
linux-fpga (ubuntu-20.04, debug)	2h 36m 52s
linux (ubuntu-20.04, release)	1h 44m 46s
misspell	15s
linux (ubuntu-20.04, codecov)	1h 41m 46s
Build SLES image	5s
Build image	6s
sles	0s
format	0s
cppcheck	0s
tidy	0s
	8h 49m 43s

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