build(deps): bump external/bpf_conformance from 7a773b3 to 8bd493f (

vbpf#554)

Bumps [external/bpf_conformance](https://github.com/Alan-Jowett/bpf_conformance) from `7a773b3` to `8bd493f`.
- [Release notes](https://github.com/Alan-Jowett/bpf_conformance/releases)
- [Commits](Alan-Jowett/bpf_conformance@7a773b3...8bd493f)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>