upgrade cilium/ebpf to v0.20.0

[mmat11]

Changelog: https://github.com/cilium/ebpf/releases/tag/v0.20.0

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 55.16%. Comparing base (2dd80df) to head (7fdebbc).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #866      +/-   ##
==========================================
+ Coverage   46.27%   55.16%   +8.88%     
==========================================
  Files         251      251              
  Lines       21483    21483              
==========================================
+ Hits         9942    11851    +1909     
+ Misses      10899     8816    -2083     
- Partials      642      816     +174     

Flag	Coverage Δ
integration-test	23.28% <ø> (?)
integration-test-arm	0.00% <ø> (?)
integration-test-vm-${ARCH}-${KERNEL_VERSION}	0.00% <ø> (?)
k8s-integration-test	2.76% <ø> (?)
oats-test	0.00% <ø> (?)
unittests	46.27% <ø> (ø)

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[grcevski]

LGTM!