fix(deps): update dependency @rnx-kit/react-native-host to v0.5.6

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@rnx-kit/react-native-host (source)	0.5.5 -> 0.5.6

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Release Notes

microsoft/rnx-kit (@​rnx-kit/react-native-host)

v0.5.6

Compare Source

Patch Changes

• 6880afa: Fixed SurfaceRegistryBinding::startSurface failing on 0.75 (and
  older)
• fa2feb4: Fixed invalid application of sizeof to an incomplete type
  facebook::react::JSExecutorFactory

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