Bump gadget-sdk from 69710ac to 81e1f0e

Bumps [gadget-sdk](https://github.com/webb-tools/gadget) from `69710ac` to `81e1f0e`.
- [Release notes](https://github.com/webb-tools/gadget/releases)
- [Commits](tangle-network/gadget@69710ac...81e1f0e)

---
updated-dependencies:
- dependency-name: gadget-sdk
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>