Draft: ci: Uprev mesa and fix the debian/x86_test-{gl,vk} references

Sergi Blanch Torné requested to merge (removed):image-tags into master

Mesa has been updated because of confusion in some variables to define the test images when one likes to use GL or VK. Because of that, the uprev is necessary together with a change in naming those variables. So, the jobs extending from .use-{gl,vk}-test-image will now be sure they are using the correct image.

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