Update base tag for release-6.2 to swift-6.2-DEVELOPMENT-SNAPSHOT-2025-09-05-a#644

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update-base-tag/release-6.2-swift-6.2-DEVELOPMENT-SNAPSHOT-2025-09-05-aswiftwasm/swiftwasm-build:update-base-tag/release-6.2-swift-6.2-DEVELOPMENT-SNAPSHOT-2025-09-05-aCopy head branch name to clipboard