Update testcontainers-java monorepo to v1.21.3

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This PR contains the following updates:

Package	Change	Age	Confidence
org.testcontainers:junit-jupiter (source)	1.21.1 -> 1.21.3
org.testcontainers:testcontainers (source)	1.21.1 -> 1.21.3

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Release Notes

testcontainers/testcontainers-java (org.testcontainers:junit-jupiter)

v1.21.3

Compare Source

What's Changed

• Update testcontainers/sshd version to 1.3.0 (#​10377) @​eddumelendez
• Support docker/mcp-gateway image (#​10378) @​eddumelendez
• Update testcontainers version to 1.21.2 (#​10369) @​github-actions
• Update docs version to 1.21.2 (#​10368) @​github-actions

v1.21.2

Compare Source

What's Changed

• Update ryuk version to 0.12.0 (#​10357) @​eddumelendez
• Update docs version to 1.21.1 (#​10281) @​github-actions
• Update testcontainers version to 1.21.1 (#​10282) @​github-actions

📖 Documentation

• Add DockerMcpGatewayContainer (#​10364) @​eddumelendez

📦 Dependency updates

• Update Gradle Wrapper from undefined to 8.14.2 (#​10352) @​github-actions

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