Update fips-containers.istio.tetratelabs.com/proxyv2:1.19.4-tetratefips-v0-distroless Docker digest to a02b73c

This MR contains the following updates:

Package	Type	Update	Change
fips-containers.istio.tetratelabs.com/proxyv2	ironbank-docker	digest	74b7b27 -> a02b73c

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