build(deps): bump external/bpf_conformance from d9f157b to b8249f5 (

#191)

Bumps [external/bpf_conformance](https://github.com/Alan-Jowett/bpf_conformance) from `d9f157b` to `b8249f5`.
- [Release notes](https://github.com/Alan-Jowett/bpf_conformance/releases)
- [Commits](Alan-Jowett/bpf_conformance@d9f157b...b8249f5)

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

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