Bump pyarrow from 4.0.1 to 6.0.1

Bumps pyarrow from 4.0.1 to 6.0.1.

Commits

• c02ac38 ARROW-14358: [Doc] Update CMake options in documentation
• b3767f7 ARROW-14291: [CI][C++] Add cpp/examples/ files to lint targets
• ae50af6 ARROW-14313: [Doc] Make Archery installation docs more accurate
• 74caee2 ARROW-14236: [C++] Add GCS testbench for testing
• 754a692 ARROW-14295: [Doc] Indicate location of archery
• d7467f4 ARROW-14070: [C++][CI] Remove support for VS2015
• ce34ea1 ARROW-14062: [Format] Initial arrow-internal specification of compute IR
• 3ddd3b6 ARROW-14013: [C++][Docs] Add instructions for Fedora
• 1229858 ARROW-13379: [Dev][Docs] Improvements to archery docs
• ec52951 ARROW-13224: [Python][Doc] Documentation missing for pyarrow.dataset.write_da...
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