Update software.yaml

[BERENZ]

information about the nonprobsvy package recently uploaded to CRAN. The package implements state-of-the-art methods for non-probability samples with focus on variance estimation. Details can be found in: Wu et al. (2020) <doi:10.1080/01621459.2019.1677241>, Kim et al. (2021) <doi:10.1111/rssa.12696>, Wu et al. (2023) https://www150.statcan.gc.ca/n1/pub/12-001-x/2022002/article/00002-eng.htm, Kim et al. (2021) https://www150.statcan.gc.ca/n1/pub/12-001-x/2021001/article/00004-eng.htm, Kim et al. (2020) <doi:10.1111/rssb.12354>.