chore(deps): bump the docker-tests group in /tests with 2 updates (#8237)

* chore(deps): bump the docker-tests group in /tests with 2 updates

Bumps the docker-tests group in /tests with 2 updates: kindest/node and [skopeo/stable](https://github.com/containers/image_build).


Updates `kindest/node` from v1.33.4 to v1.34.0

Updates `skopeo/stable` from v1.19.0 to v1.20.0
- [Commits](https://github.com/containers/image_build/commits)

---
updated-dependencies:
- dependency-name: kindest/node
  dependency-version: v1.34.0
  dependency-type: direct:production
  dependency-group: docker-tests
- dependency-name: skopeo/stable
  dependency-version: v1.20.0
  dependency-type: direct:production
  dependency-group: docker-tests
...

Signed-off-by: dependabot[bot] <[email protected]>

* Update tests/Dockerfile

Co-authored-by: Gabor Javorszky <[email protected]>
Signed-off-by: Venktesh Shivam Patel <[email protected]>

* update sha to latest

* update skopeo to use immutable images

---------

Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: Venktesh Shivam Patel <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Venktesh Shivam Patel <[email protected]>
Co-authored-by: Gabor Javorszky <[email protected]>

Author: 3 people

tests/Dockerfile

@@ -1,9 +1,9 @@
 # syntax=docker/dockerfile:1.16
 # this is here so we can grab the latest version of kind and have dependabot keep it up to date
-FROM kindest/node:v1.33.4@sha256:25a6018e48dfcaee478f4a59af81157a437f15e6e140bf103f85a2e7cd0cbbf2
+FROM kindest/node:v1.34.0@sha256:7416a61b42b1662ca6ca89f02028ac133a309a2a30ba309614e8ec94d976dc5a
 
 # this is here so we can grab the latest version of skopeo and have dependabot keep it up to date
-FROM quay.io/skopeo/stable:v1.19.0@sha256:77e6c8901f6976bdfa87b8b14c40b96de754794c492d8ed295f77fba1454a4ab
+FROM quay.io/skopeo/stable:v1.20.0-immutable@sha256:519b95573a7490eb4740c8180d3dc33d86417222956e655719e74d3509586a33
 
 FROM python:3.13-bookworm@sha256:aba8a0cd72f259c2737c8a47050652036c8bc8266a4f39291523a45cf8081960