Update python@3.8 dependencies to python@3.9

[sjackman]

1. Bump revision if present or otherwise add revision 1
2. Change depends_on "python@3.8" to depends_on "python@3.9".

• cutadapt
• flowcraft
• flye
• gatk
• kat kat 2.4.2 #1174
• matplotlib kat 2.4.2 #1174
• nanofilt
• nanopolish
• ngmaster
• ntjoin
• racon
• sambamba
• tigmint
• unicycler
• vcf2phylip

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1. Bump revision if present or otherwise add revision 1
2. Change depends_on "python" to depends_on "python@3.9".

• apbspdb2pqr
• bam2fastx
• bowtie
• circlator
• freebayes
• hh-suite hh-suite 3.3.0 #1188
• humann2
• iva
• kmergenie
• lofreq
• megahit
• metaphlan
• oma
• porechop
• portcullis
• quast
• salmid
• sepp
• sibelia
• transabyss
• vcflib
• viennarna
• xmatchview