Bump subxt from 0.18.1 to 0.19.0 (use-ink#472)

Bumps [subxt](https://github.com/paritytech/subxt) from 0.18.1 to 0.19.0.
- [Release notes](https://github.com/paritytech/subxt/releases)
- [Changelog](https://github.com/paritytech/subxt/blob/master/CHANGELOG.md)
- [Commits](paritytech/subxt@v0.18.1...v0.19.0)

---
updated-dependencies:
- dependency-name: subxt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Cargo.toml

@@ -55,7 +55,7 @@ scale-info = { version = "2.0.1", default-features = false, features = ["derive"
 sp-core = "6.0.0"
 sp-runtime = "6.0.0"
 pallet-contracts-primitives = "6.0.0"
-subxt = "0.18.1"
+subxt = "0.19.0"
 futures = "0.3.19"
 hex = "0.4.3"
 jsonrpsee = { version = "0.9.0", features = ["ws-client"] }