v3.15.0b4
[3.15] gh-152785: Upgrade Java from 17 to 21 in GHA Android (GH-152783) (#152920)
[3.15] gh-153631: Move to `macos-26` runner for iOS (GH-153632) (#153673)
[3.15] gh-151929: Add pythoninfo commands to Platforms/WASI (GH-152136) (#152222)
[3.15] gh-153313: Run Emscripten PyRepl test in CI (GH-153701) (#153727)