Add upper limit version constraint for scipy on 3.6.x #20237

Job	Run time
Check for file changes	7s
Check for file changes	7s
Check for file changes	7s
Check for file changes	7s
Check for file changes	7s
Documentation Linting Checks	4m 37s
Documentation Linting Checks	3m 41s
Documentation Linting Checks	3m 46s
Documentation Linting Checks	3m 51s
Documentation Linting Checks	3m 48s
Test Documentation	4m 35s
Test Documentation	4m 35s
Test Documentation	4m 35s
Test Documentation	4m 35s
Test Documentation	4m 35s
	43m 13s

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