chore: update v1.19 to latest argo-rollouts-manager

[jgwest]

What type of PR is this?
/kind enhancement

What does this PR do / why we need it:

• Updates v1.19 to the latest from argo-rollouts-manager, picking up Rollouts v1.8.4 which contains a security fix.

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[Rizwana777]

LGTM

[jgwest]

Thanks @Rizwana777!