build(deps): bump external/bpf_conformance in the actions group (#636)

Bumps the actions group with 1 update: [external/bpf_conformance](https://github.com/Alan-Jowett/bpf_conformance).


Updates `external/bpf_conformance` from `514fa97` to `318cc3b`
- [Release notes](https://github.com/Alan-Jowett/bpf_conformance/releases)
- [Commits](Alan-Jowett/bpf_conformance@514fa97...318cc3b)

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

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