Bump addon-manager's version to v9.1.0

[tosi3k]

What type of PR is this?
/kind feature

What this PR does / why we need it:
This PR is needed to release #91018.

I will update the manifests in a separate PR.

Which issue(s) this PR fixes:

No issue is opened for that.

Special notes for your reviewer:
/sig scalability
/assign mm4tt

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

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[mm4tt]

/ok-to-test

[mm4tt]

/lgtm
/assign @wojtek-t

[wojtek-t]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: tosi3k, wojtek-t

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