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CI: parallel builds again once rattler-build fixes #2898 (reverts #162) - #163

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Reverts #162: builds recipes in parallel again on Linux and macOS (PARALLEL_BUILDS = f"3:{os.cpu_count()}" off Windows, as before).

Draft until rattler-build ships the fix. #162 switched to one build at a time because rattler-build 0.77 gives two variants of a recipe the same build directory when they start in the same second (prefix-dev/rattler-build#2898; beluga's hdf5 variants failed on every humble and jazzy build branch). The fix is prefix-dev/rattler-build#2899.

Before merging:

CI: build:none.

🤖 Generated with Claude Code

Reverts #162 once rattler-build ships the fix for variants sharing a
build directory (prefix-dev/rattler-build#2899, for #2898). Bump the
rattler-build pin in pixi.toml to that release at the same time.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
@Tobias-Fischer Tobias-Fischer added the build:none PR build: build no packages, only run the checks (tooling, CI or docs changes) label Oct 25, 2026
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