Update dependency @blueprintjs/core to v5.19.1 #1843

Job	Run time
Get packages within the repository	29s
Repo Wide Tasks	3m 8s
${{ matrix.tabInfo.tabName }} Tab	0s
${{ matrix.bundleInfo.bundleName }} Bundle	0s
Dev Server Tasks	0s
Docs Server Tasks	0s
${{ matrix.lib.name }} library (${{ matrix.os }})	0s
Verify all tests pass and build success	0s
	3m 37s

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