tests: make weak-table weakness tests robust under conservative GC - #1815

The 'defaults' channel might have been added implicitly. If this is intentional, add 'defaults' to the 'channels' list. Otherwise, consider setting 'conda-remove-defaults' to 'true'.

llvm@19 was installed but not linked because llvm@20 is already installed. To link this version, run: brew link llvm@19

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