Fix getMediation bug · microbiome/mia@7d87ca0

--- re-building 'mia.Rmd' using rmarkdown

processing vignette 'mia.Rmd' failed with diagnostics:

Vignette re-building failed.

Build process failed

Process completed with exit code 1.

dependencies 'BiocVersion', 'BiocStyle' are not available

unable to access index for repository https://www.bioconductor.org/packages/3.21/workflows/bin/windows/contrib/4.5:

No files were found with the provided path: check. No artifacts will be uploaded.

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