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Apache Arrow 21.0.0

Release Notes URL: https://arrow.apache.org/release/21.0.0.html

Apache Arrow 21.0.0 RC6

Release Notes: Release Candidate: 21.0.0 RC6

Apache Arrow 21.0.0 RC5

Release Notes: Release Candidate: 21.0.0 RC5

Apache Arrow 21.0.0 RC4

Release Notes: Release Candidate: 21.0.0 RC4

Apache Arrow 21.0.0 RC3

Release Notes: Release Candidate: 21.0.0 RC3

Apache Arrow 21.0.0 RC2

Release Notes: Release Candidate: 21.0.0 RC2

• ee4d09e MINOR: [Release] Update versions for 21.0.0
• f13a579 MINOR: [Release] Update .deb/.rpm changelogs for 21.0.0
• 6fd2a16 MINOR: [Release] Update CHANGELOG.md for 21.0.0
• cf261bf GH-47078: [Release] Ensure using cloned apache/arrow for reproducible check (...
• ddbc3dc GH-47074: [Release] Use reproducible mtime for csharp/ in source archive (#47...
• 0534eb2 GH-47071: [Release] Dereference all hard links in source archive (#47072)
• f845b41 GH-47069: [Release] Add missing "needs: target" (#47070)
• 1c08f8e GH-47067: [Release] Fix wrong GitHub Actions context in verify_rc.yml (#47068)
• 70e5c51 GH-47065: [Release] Fix timeout key in verify_rc.yml (#47066)
• 254a85c GH-47063: [Release] Define missing RELEASE_TARBALL (#47064)
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