Bump external/ubpf from `cf05de5` to `40c047c` (#2034)

Bumps [external/ubpf](https://github.com/iovisor/ubpf) from `cf05de5` to `40c047c`.
- [Release notes](https://github.com/iovisor/ubpf/releases)
- [Commits](cf05de538f...40c047c5ad)

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

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external/ubpf

@@ -1 +1 @@
-Subproject commit cf05de538f91fc20adfb8f5b0915f8df930939c4
+Subproject commit 40c047c5ad7e6926e9c09be9d222a3362bafe798