Add Mamba to list of adoptions

Signed-off-by: Joshua Lock <[email protected]>

Author: joshuagl

data/adoptions.yaml

@@ -34,4 +34,6 @@ ongoing:
 - url: https://github.com/php-tuf/php-tuf
   tag: PHP
 - url: https://www.python.org/dev/peps/pep-0458/
-  tag: PyPI
+  tag: PyPI
+- url: https://mamba.readthedocs.io/en/latest/advanced_usage/artifacts_verification.html
+  tag: mamba