build(deps): bump docker/jetson-flash from 3ab562c to b254209

Bumps [docker/jetson-flash](https://github.com/balena-os/jetson-flash) from `3ab562c` to `b254209`.
- [Release notes](https://github.com/balena-os/jetson-flash/releases)
- [Commits](balena-os/jetson-flash@3ab562c...b254209)

---
updated-dependencies:
- dependency-name: docker/jetson-flash
  dependency-type: direct:production
...

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Author: dependabot[bot]