bump version to 4.5.6 #399

Job	Run time
Test Processing	6m 13s
(macos/x64) Create Processing Build	3m 18s
(linux/aarch64) Create Processing Build	3m 26s
(macos/aarch64) Create Processing Build	3m 39s
(linux/x64) Create Processing Build	4m 40s
(windows/x64) Create Processing Build	5m 10s
	26m 26s

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