Add the release note 1.29.4

[minwoox]

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[github-actions]

🔍 Build Scan® (commit: abe952a)

Job name	Status	Build Scan®
build-windows-latest-jdk-21	✅	https://ge.armeria.dev/s/knukneei66puc
build-self-hosted-unsafe-jdk-8	✅	https://ge.armeria.dev/s/52ggu6jxxjjkm
build-self-hosted-unsafe-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/3l74gndlj3n2u
build-self-hosted-unsafe-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/e27mvmy7sjlos
build-self-hosted-unsafe-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/jblak2kqxnl74
build-self-hosted-unsafe-jdk-17-leak	✅	https://ge.armeria.dev/s/ostzfqz6iwfka
build-self-hosted-unsafe-jdk-11	✅	https://ge.armeria.dev/s/qcgylm67rwqci
build-macos-12-jdk-21	✅	https://ge.armeria.dev/s/q6eahjzjcvuza

[jrhee17]

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[ikhoon]

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