chore(deps): Update testcontainers requirement from 0.14 to 0.15

Updates the requirements on [testcontainers](https://github.com/testcontainers/testcontainers-rs) to permit the latest version.
- [Release notes](https://github.com/testcontainers/testcontainers-rs/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-rs/blob/dev/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-rs@0.14.0...0.15)

---
updated-dependencies:
- dependency-name: testcontainers
  dependency-type: direct:production
...

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

Cargo.toml

@@ -63,6 +63,6 @@ docker_credential = "1.0"
 hmac = "0.12"
 tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 tempfile = "3.3"
-testcontainers = "0.14"
+testcontainers = "0.15"
 tokio = { version = "1.21", features = ["macros", "fs", "rt-multi-thread"] }
 tokio-util = { version = "0.7.4", features = ["compat"] }