Bump external/ubpf from `074513b` to `d6bcc68` (#3746)

Bumps [external/ubpf](https://github.com/iovisor/ubpf) from `074513b` to `d6bcc68`.
- [Commits](074513b39e...d6bcc682c3)

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

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external/ubpf

@@ -1 +1 @@
-Subproject commit 074513b39e0b7af4884328ffd8925532e57c9841
+Subproject commit d6bcc682c3901cb3ceb185baaefeef7827996d1b