Rust 1.75 (staging)

[ojeda]

Could a sysadmin please create the kernelci/staging-rustc-1.75 and kernelci/rustc-1.75 repositories on Docker hub?

Please note that in the staging patches, as usual, I only change the version, but we would like to keep both the latest and the previous latest -- is it needed that we test both here, or just the latest added? Please see my note at https://github.com/kernelci/kernelci-core/pull/2321.

Upgrade PRs:

• https://github.com/kernelci/kernelci-core/pull/2321.
• https://github.com/kernelci/kernelci-deploy/pull/121.
• https://github.com/kernelci/kernelci-deploy/pull/122.