Gardener CI Robot 1

[ci:component:github.com/gardener/etcd-custom-image:v3.4.26-7->v3.5.2]

2

**Release Notes**: ```improvement user github.com/gardener/etcd-custom-image #1 @shreyas-s-rao Build etcd bootstrap script into the custom etcd image. ``` ```noteworthy operator github.com/gardener/etcd-custom-image $3113a1d134e05592ac123248183a15da745c9533 @gardener-robot-ci-1 Update etcd version from v3.5.1 to v3.5.2. :warning:...