Bump third_party/bouffalolab/repo from dbca8b0 to a3be70d

Bumps [third_party/bouffalolab/repo](https://github.com/bouffalolab/bl_iot_sdk_tiny) from `dbca8b0` to `a3be70d`.
- [Commits](bouffalolab/bl_iot_sdk_tiny@dbca8b0...a3be70d)

---
updated-dependencies:
- dependency-name: third_party/bouffalolab/repo
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>