update CA image in charts for 1.21,1.22,1.23,1.24,1.25,1.26

[elankath]

How to categorize this PR?

/area auto-scaling
/kind enhancement

What this PR does / why we need it:
Updates the CA images in the charts for v1.21, v1.22, v1.23, v1.24, v1.25, v1.26

Which issue(s) this PR fixes:
Part of #6773

Special notes for your reviewer:

Release note:

The following images are updated:
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.21.4` -> `v1.21.5` (for Kubernetes `1.21`)
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.22.4` -> `v1.22.5` (for Kubernetes `1.22`)
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.23.2` -> `v1.22.3` (for Kubernetes `1.23`)
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.24.1` -> `v1.24.2` (for Kubernetes `1.24`)
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.25.1` -> `v1.25.2` (for Kubernetes `1.25`)
- `eu.gcr.io/gardener-project/gardener/autoscaler/cluster-autoscaler`: `v1.26.1`  (for Kubernetes `1.26`)

[rfranzke]

/lgtm
/approve

[gardener-prow]

LGTM label has been added.

Git tree hash: 4fa3bf99e7acbb6057b6953124809b55e3102782

[gardener-prow]

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