chore(main): release testcontainers 4.15.0

[github-actions]

🤖 I have created a release beep boop

4.15.0 (2026-04-04)

Features

• compose: add structured container inspect information (#897) (58459a1)
• core: support SSH-based DOCKER_HOST (#993) (d48115d)
• generic: Reintroducing the generic SQL module (#892) (2ca2321)
• keycloak: support for relative path and management relative path (#982) (898faf6)
• mqtt: MosquittoContainer: Add version 2.1.2 (#978) (af382f7)

Bug Fixes

• azurite: make visible to type checkers (#927) (baa5668)
• clickhouse: add HttpWaitStrategy instead of deprecated wait_container_is_ready (#962) (8034541)
• compose: return type in get_service_port docstring (#939) (fed65fe)
• core: Refactor copy file (#996) (0e0bb24)
• core: wait for ryuk more reliably, improve tests: long_running, filter logs (#984) (b12ae13)
• generic: Migrate ServerContainer from deprecated decorator to HttpWaitStrategy (#971) (460b0d8)
• kafka: Use wait strategy instead of deprecated wait_for_logs (#903) (87332c1)
• postgres: add py.typed marker to postgres module (#849) (c8a5bbd)
• qdrant: migrate Qdrant from deprecated decorator. (#963) (407f798)
• sftp: Avoid using wait_for_logs in module. (#995) (83157eb)

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[alexanderankin]

do not release yet, release RC first with release-please cli