Bump external/ubpf from e0823b2 to 288fc43 (#4319)

Bumps [external/ubpf](https://github.com/iovisor/ubpf) from `e0823b2` to `288fc43`.
- [Commits](iovisor/ubpf@e0823b2...288fc43)

---
updated-dependencies:
- dependency-name: external/ubpf
  dependency-version: 288fc432fa8345f0d226b0a3948a50462776f198
  dependency-type: direct:production
...

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