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CentOS 7 docker images are now the default

We are moving all conda-forge linux-64 jobs to use CentOS 7-based docker images. This will help users avoid conda/mamba solver errors where dependencies that need CentOS 7 cannot be installed. Importantly, our compiler stack will still default to using a CentOS 6 sysroot unless the recipe explicitly lists the CentoOS 7 sysroot package. This build configuration means that our core system ABI on linux will remain largely CentOS 6-compatible, keeping support for older systems largely intact. We will reconsider moving the default ABI to CentOS 7 at a later date.