Move to macos-15

[Abacn]

Fix #31114

testing - https://github.com/apache/beam/actions/runs/19680605287

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[Abacn]

R: @shunping @damccorm

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[shunping]

I notice that the builds on macos-15 in https://github.com/apache/beam/actions/runs/19680605287 all took about 1.5 mins, while the ones on ubuntu and windows took 15+ and 4+ mins, respectively.

Can we reconfirm the macos ones are built correctly from scratch?

[Abacn]

Yes. I see logs

1 wheels produced in 2 minutes:
  apache_beam-2.70.0.dev0-cp313-cp313-macosx_11_0_arm64.whl   5,779 kB

and

Artifact download URL: https://github.com/apache/beam/actions/runs/19680605287/artifacts/4677417138

I was able to install beam from the wheel, and run

>>> import apache_beam as beam

>>> beam.version.__version__
'2.70.0.dev'

[shunping]

Perfect! Thanks.