Update snapatac2 to 2.6.4 (#6157) #14

Job	Run time
Setup cache and determine changed repositories (3.11)	4m 34s
Lint R scripts (ubuntu-20.04, release)	3m 19s
Lint Python scripts	0s
Lint tool-list (3.11)	1m 46s
Check file sizes	0s
Test tools (0, 3.11)	25m 8s
Test tools (1, 3.11)	11m 44s
Test tools (2, 3.11)	54m 38s
Test tools (3, 3.11)	54m 35s
Combine chunked test results (3.11)	33s
Check workflow success	0s
Deploy	0s
Report deploy status	0s
	2h 36m 17s

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