[1.9] CMAKE_POLICY_VERSION_MINIMUM=3.5

[cxzl25]

What changes were proposed in this pull request?

Why are the changes needed?

https://github.com/actions/runner-images/issues/12934

Success https://github.com/apache/orc/actions/runs/17684310687/job/50265505914

Runner Image
  Image: macos-14-arm64
  Version: 20250901.1774
  Included Software: https://github.com/actions/runner-images/blob/macos-14-arm64/20250901.1774/images/macos/macos-14-arm64-Readme.md

Failed https://github.com/apache/orc/actions/runs/18735596344/job/53524232003?pr=2452

Runner Image
  Image: macos-14-arm64
  Version: 20251013.0032
  Included Software: https://github.com/actions/runner-images/blob/macos-14-arm64/20251013.0032/images/macos/macos-14-arm64-Readme.md

How was this patch tested?

Was this patch authored or co-authored using generative AI tooling?

[dongjoon-hyun]

Thank you, @cxzl25 . If it's difficult, we may want to upgrade MacOS CI inevitably in branch-1.9 from 14 to 15+.

ORC-1995: Add `MacOS 26` to GitHub Action CI and docs
ORC-1895: Add `MacOS 15` to `macos-cpp-check` GitHub Action job
ORC-1783: Add MacOS 15 to GitHub Action MacOS CI and docs

[cxzl25]

we may want to upgrade MacOS CI inevitably in branch-1.9 from 14 to 15+.

As described in the issue associated with the PR, I estimate that the reason is that the CI of the 1.9 branch failed due to the upgrade of macos image cmake from version 3.x to 4.x. After upgrading to macos15, the cmake version is also 4.x. After testing, it also failed.

[dongjoon-hyun]

Got it. Thank you for investigating.