Bump external/ubpf from `77553ab` to `2b16153` (#3152)

Bumps [external/ubpf](https://github.com/iovisor/ubpf) from `77553ab` to `2b16153`.
- [Commits](77553ab650...2b1615322c)

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

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external/ubpf

@@ -1 +1 @@
-Subproject commit 77553ab6501fad0e4abc478bfdef37b229f29a5d
+Subproject commit 2b1615322cbd097a61d72bde27ffc4f10de58e07