[INTERNAL] bump seqan version prior to 2.3.1 release
[INTERNAL] bump seqan version prior to 2.3.1 release

xenigmax/seqan,bestrauc/seqan,xenigmax/seqan,bestrauc/seqan,xenigmax/seqan,bestrauc/seqan,xenigmax/seqan,xenigmax/seqan,xenigmax/seqan,bestrauc/seqan,bestrauc/seqan,bestrauc/seqan,xenigmax/seqan,bestrauc/seqan,xenigmax/seqan,bestrauc/seqan