Update metro monorepo to v0.56.0

This MR contains the following updates:

Package	Type	Update	Change
metro-config	dependencies	minor	0.55.0 -> 0.56.0
metro-core	dependencies	minor	0.55.0 -> 0.56.0
metro-react-native-babel-preset	devDependencies	minor	0.55.0 -> 0.56.0
metro-react-native-babel-transformer	devDependencies	minor	0.55.0 -> 0.56.0

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