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Moving to GCC 15 and Clang 21 as default compiler versions

As part of our regular toolchain updates, we're planning to update the baseline versions of GCC (our default compiler on Linux) to v15 and of Clang (default on macOS) to v21, in one week.

For more details, see https://github.com/conda-forge/conda-forge-pinning-feedstock/pull/8795.