Update fips-containers.istio.tetratelabs.com/istioctl Docker tag to v1.26.3

This MR contains the following updates:

Package	Type	Update	Change
fips-containers.istio.tetratelabs.com/istioctl		patch	1.26.2 -> 1.26.3
fips-containers.istio.tetratelabs.com/istioctl	ironbank-docker	patch	1.26.2-tetratefips-crypto-updatestream0 -> 1.26.3-tetratefips-crypto-updatestream0
fips-containers.istio.tetratelabs.com/istioctl	stage	patch	1.26.2-tetratefips-crypto-updatestream0 -> 1.26.3-tetratefips-crypto-updatestream0

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