deps: update LTS and mainline kernels

[malt3]

Context

New kernel releases are available. Please also review https://github.com/edgelesssys/constellation-kernel/pull/11.

Proposed change(s)

• deps: update LTS kernel 6.1.79 -> 6.1.90
• deps: update LTS kernel 6.7.6 -> 6.8.9

Related issue

• image build

Checklist

• [x] Run the E2E tests that are relevant to this PR's changes
  • [x] e2e test Azure SNP
  • [x] e2e test Azure TDX
• [x] Update docs
• [x] Add labels (e.g., for changelog category)
• [x] Is PR title adequate for changelog?
• [x] Link to Milestone

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