Update BWA_INDEX memory formula to match BWAMEM2_INDEX pattern

[Copilot]

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Description

BWA_INDEX fails on HPC systems with strict memory limits. Applied the same memory allocation pattern used in BWAMEM2_INDEX.

Changes

Updated modules/nf-core/bwa/index/main.nf:

- memory { 6.B * fasta.size() }
+ memory { (53.7.MB * Math.ceil(fasta.size() / 10000000)) * task.attempt }

• Floor-based allocation: 53.7MB minimum (5.37x per BWA docs)
• task.attempt multiplier enables retry with increased memory on failure
• Maintains 5.37x scaling: 53.7MB / 10MB = 5.37

Identical pattern to BWAMEM2_INDEX (28x scaling, 280MB floor).

Original prompt

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This section details on the original issue you should resolve

<issue_title>BWA_INDEX just needs an update like BWAMEM2_INDEX in PR#8993</issue_title>
<issue_description>It's failing on some HPC systems</issue_description>

<agent_instructions>Update the memory request for BWA_INDEX just like the memory request in BWAMEM2_index but with the values specific for BWA_INDEX</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes BWA_INDEX just needs an update like BWAMEM2_INDEX in PR#8993 #9527

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