chore(deps): bump github.com/bitcoin-sv/spv-wallet-go-client

Bumps [github.com/bitcoin-sv/spv-wallet-go-client](https://github.com/bitcoin-sv/spv-wallet-go-client) from 1.0.0-beta.19 to 1.0.0-beta.21.
- [Release notes](https://github.com/bitcoin-sv/spv-wallet-go-client/releases)
- [Changelog](https://github.com/bitcoin-sv/spv-wallet-go-client/blob/main/.goreleaser.yml)
- [Commits](bitcoin-sv/spv-wallet-go-client@v1.0.0-beta.19...v1.0.0-beta.21)

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

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