Bump external/bpf_conformance from `16f6287` to `b606d2a` (#1779)

Bumps [external/bpf_conformance](https://github.com/Alan-Jowett/bpf_conformance) from `16f6287` to `b606d2a`.
- [Release notes](https://github.com/Alan-Jowett/bpf_conformance/releases)
- [Commits](16f6287324...b606d2a630)

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

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external/bpf_conformance

@@ -1 +1 @@
-Subproject commit 16f6287324bf7d31e2128990f513cf15b2d0bc24
+Subproject commit b606d2a6305e34daafffda4376333ac2f7dfcadb