Bump external/ubpf from `b0a1d98` to `7acf505` (#3066)

Bumps [external/ubpf](https://github.com/iovisor/ubpf) from `b0a1d98` to `7acf505`.
- [Commits](b0a1d98fa0...7acf50548a)

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

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external/ubpf

@@ -1 +1 @@
-Subproject commit b0a1d98fa0a3368c5400ce2cb578fd3421ad100c
+Subproject commit 7acf50548a8679b8043942c9a8745e816fcffeef