Update pyarrow requirement from <20,>=15 to >=15,<21

[dependabot[bot]]

Updates the requirements on pyarrow to permit the latest version.

Release notes

Sourced from pyarrow's releases.

Apache Arrow 20.0.0

Release Notes URL: https://arrow.apache.org/release/20.0.0.html

Commits

• 3ad0370 MINOR: [Release] Update versions for 20.0.0
• e4aed0d MINOR: [Release] Update .deb/.rpm changelogs for 20.0.0
• 02f9dfb MINOR: [Release] Update CHANGELOG.md for 20.0.0
• 92c3e39 GH-46077: [CI][C++] Disable -Werror on macos-13 (#46106)
• 2f82cd8 GH-46123: [C++] Undefined behavior in compare_internal.cc and `light_array_...
• af15118 GH-46159: [CI][C++] Stop using possibly missing boost/process/v2.hpp on boost...
• 7a6eefe GH-46169: [CI][R] Update R version to 4.5 due to 4.4 not being on APT reposit...
• 5c1eb91 GH-46167: [R][CI] Update Artifacts for R 4.5 in task.yml (#46168)
• 0f41ecc GH-45986: [C++] Update bundled GoogleTest (#45996)
• 1e2aa39 GH-46075: [Release][CI] Fix binary verification (#46076)
• Additional commits viewable in compare view

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