bump kernel for BPF lockdown

[christoph-zededa]

amd64_v6.1.38_generic: https://github.com/lf-edge/eve-kernel/compare/e0f7423a397f...fb31ce85306c

amd64_v6.1.38_rt: https://github.com/lf-edge/eve-kernel/compare/6e14ff1f47dd...08e4fdb34436

v6.1.68_generic: https://github.com/lf-edge/eve-kernel/compare/c825cbffe24f...45e0ac394428

arm64_v6.1.38_generic: https://github.com/lf-edge/eve-kernel/compare/39d6c83d31ea...369b61c861e7

riscv64_v6.1.38_generic: https://github.com/lf-edge/eve-kernel/compare/a90bcdfa08f8...2dbca8568caf

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 17.51%. Comparing base (2c5fb18) to head (57049d3). Report is 65 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3997 +/- ## ======================================= Coverage 17.51% 17.51% ======================================= Files 3 3 Lines 805 805 ======================================= Hits 141 141 Misses 629 629 Partials 35 35 ```

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