Update istio/pilot Docker tag Manually update SHA values in hardening_manifest.yaml.

This MR contains the following updates:

Package	Type	Update	Change
istio/pilot		patch	1.27.2 -> 1.27.3
istio/pilot	ironbank-docker	patch	1.27.2-distroless -> 1.27.3-distroless
istio/pilot	stage	patch	1.27.2-distroless -> 1.27.3-distroless

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