Set memory resources required to sanitize metadata

Local testing of full GISAID metadata required 300 MB of memory at peak
use, so we set the requested memory for this job to 500 MB for a little
extra buffer.

workflow/snakemake_rules/main_workflow.smk

@@ -16,6 +16,8 @@ rule sanitize_metadata:
         rename_fields=config["sanitize_metadata"]["rename_fields"],
         strain_prefixes=config["strip_strain_prefixes"],
         error_on_duplicate_strains="--error-on-duplicate-strains" if config["sanitize_metadata"].get("error_on_duplicate_strains") else "",
+    resources:
+        mem_mb=500
     shell:
         """
         python3 scripts/sanitize_metadata.py \