Bump external/bpf_conformance from 6247cdd to cca727c

Bumps [external/bpf_conformance](https://github.com/Alan-Jowett/bpf_conformance) from `6247cdd` to `cca727c`.
- [Release notes](https://github.com/Alan-Jowett/bpf_conformance/releases)
- [Commits](Alan-Jowett/bpf_conformance@6247cdd...cca727c)

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

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

Author: dependabot[bot]