Add the release note for 1.26.2

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[minwoox]

[github-actions]

🔍 Build Scan® (commit: 1f93919)

Job name	Status	Build Scan®
build-windows-latest-jdk-19	❌ (failure)	https://ge.armeria.dev/s/iuwixw4fuhri2
build-self-hosted-jdk-8	✅	https://ge.armeria.dev/s/uyjeazwko3u4i
build-self-hosted-jdk-19-snapshot-blockhound	✅	https://ge.armeria.dev/s/b6rayl6xesd74
build-self-hosted-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/qxn2yxsvhmxys
build-self-hosted-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/piy2fww42rtxw
build-self-hosted-jdk-17-leak	✅	https://ge.armeria.dev/s/m4svfuxmxccxu
build-self-hosted-jdk-11	✅	https://ge.armeria.dev/s/khpv7rqppknga
build-macos-12-jdk-19	❌ (failure)	https://ge.armeria.dev/s/ykgvwhgkpghu6

[jrhee17]

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[ikhoon]

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