bump version to 4.5.6 (#1548) #401

Job	Run time
Test Processing	3m 45s
(linux/aarch64) Create Processing Build	3m 44s
(macos/x64) Create Processing Build	4m 31s
(linux/x64) Create Processing Build	4m 35s
(macos/aarch64) Create Processing Build	6m 5s
(windows/x64) Create Processing Build	5m 16s
	27m 56s

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