[ci skip] Merge PR 21934
[ci skip] Merge PR 21934

Merge PR #21934, commits were: 
 * add ctb as recipe maintainer
 * remove khmer dependency, add enum34 for py27
 * Update sourmash to 3.3.0

ostrokach/bioconda-recipes,mdehollander/bioconda-recipes,bebatut/bioconda-recipes,shenwei356/bioconda-recipes,zachcp/bioconda-recipes,bebatut/bioconda-recipes,mdehollander/bioconda-recipes,jfallmann/bioconda-recipes,zachcp/bioconda-recipes,ostrokach/bioconda-recipes,jfallmann/bioconda-recipes,mdehollander/bioconda-recipes,gregvonkuster/bioconda-recipes,acaprez/recipes,shenwei356/bioconda-recipes,acaprez/recipes,zachcp/bioconda-recipes,cokelaer/bioconda-recipes,ostrokach/bioconda-recipes,ostrokach/bioconda-recipes,shenwei356/bioconda-recipes,rob-p/bioconda-recipes,acaprez/recipes,mdehollander/bioconda-recipes,roryk/recipes,blankenberg/bioconda-recipes,rob-p/bioconda-recipes,peterjc/bioconda-recipes,bioconda/bioconda-recipes,mdehollander/bioconda-recipes,blankenberg/bioconda-recipes,phac-nml/bioconda-recipes,jfallmann/bioconda-recipes,peterjc/bioconda-recipes,phac-nml/bioconda-recipes,cokelaer/bioconda-recipes,blankenberg/bioconda-recipes,ostrokach/bioconda-recipes,roryk/recipes,gregvonkuster/bioconda-recipes,npavlovikj/bioconda-recipes,peterjc/bioconda-recipes,cokelaer/bioconda-recipes,rob-p/bioconda-recipes,gregvonkuster/bioconda-recipes,jfallmann/bioconda-recipes,npavlovikj/bioconda-recipes,mdehollander/bioconda-recipes,cokelaer/bioconda-recipes,phac-nml/bioconda-recipes,roryk/recipes,rob-p/bioconda-recipes,bioconda/bioconda-recipes,npavlovikj/bioconda-recipes,peterjc/bioconda-recipes,phac-nml/bioconda-recipes,phac-nml/bioconda-recipes,peterjc/bioconda-recipes,bioconda/bioconda-recipes,gregvonkuster/bioconda-recipes,npavlovikj/bioconda-recipes,zachcp/bioconda-recipes,shenwei356/bioconda-recipes,ostrokach/bioconda-recipes,bioconda/bioconda-recipes,bebatut/bioconda-recipes,peterjc/bioconda-recipes,blankenberg/bioconda-recipes,bebatut/bioconda-recipes,acaprez/recipes