build(deps): bump github.com/bitcoin-sv/spv-wallet/models

Bumps [github.com/bitcoin-sv/spv-wallet/models](https://github.com/bitcoin-sv/spv-wallet) from 1.0.0-beta.6 to 1.0.0-beta.8.
- [Release notes](https://github.com/bitcoin-sv/spv-wallet/releases)
- [Commits](bitcoin-sv/spv-wallet@v1.0.0-beta.6...v1.0.0-beta.8)

---
updated-dependencies:
- dependency-name: github.com/bitcoin-sv/spv-wallet/models
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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