check_cellrangermulti.py doesn't handle BOM

[tgelafr-pfzr]

Description of the bug

The parse_samplesheet function breaks if the CSV has a BOM. Changing the encoding of open to "utf-8-sig" would handle cases with or without BOM. I think the BOM can be introduced if exporting via excel on windows.

Command used and terminal output

python ./bin/check_cellrangermulti.py ./assets/cellranger_barcodes_samplesheet_with_bom.csv

Relevant files

You can use the attached samplesheet within the and run the cellranger_multi human test (or just run the check_cellrangermulti.py script) to replicate the failure

cellranger_barcodes_samplesheet_with_bom.csv

System information

Error appearing on MacOS as well as via AWS batch in nf-core/scrnaseq v4.1.0