snakemake-workflows/dna-seq-varlociraptor: Version 3.3.0

Update to Varlociraptor 4.7, including various model improvements that should overall lead to a much improved FDR control and more recognized artifacts, in particular on exome data with PCR amplification (@johanneskoester). Primer handling for amplicon sequencing with only a single primer per read pair (@FelixMoelder)