Update kiwigrid/k8s-sidecar Docker tag to v1.25.3

This MR contains the following updates:

Package	Type	Update	Change
kiwigrid/k8s-sidecar	ironbank-docker	patch	1.25.2 -> 1.25.3
kiwigrid/k8s-sidecar		patch	1.25.2 -> 1.25.3
kiwigrid/k8s-sidecar	stage	patch	1.25.2 -> 1.25.3

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Release Notes

kiwigrid/k8s-sidecar

v1.25.3

Compare Source

💬 Other

• Remove misleading doc for REQ_SKIP_TLS_VERIFY
  • MR: #​310

📦 Dependencies

• build(deps): bump kubernetes from 27.2.0 to 28.1.0 in /src
  • MR: #​308

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