Adds Matt Savoie to CITATION.cff (#9103)

Author: flamingbear

CITATION.cff

@@ -84,6 +84,9 @@ authors:
 - family-names: "Scheick"
   given-names: "Jessica"
   orcid: "https://orcid.org/0000-0002-3421-4459"
+- family-names: "Savoie"
+  given-names: "Matthew"
+  orcid: "https://orcid.org/0000-0002-8881-2550"
 title: "xarray"
 abstract: "N-D labeled arrays and datasets in Python."
 license: Apache-2.0