Bump external/libbtf from 760a804 to 0a4ef1f

Bumps [external/libbtf](https://github.com/Alan-Jowett/libbtf) from `760a804` to `0a4ef1f`.
- [Release notes](https://github.com/Alan-Jowett/libbtf/releases)
- [Commits](Alan-Jowett/libbtf@760a804...0a4ef1f)

---
updated-dependencies:
- dependency-name: external/libbtf
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>