Update scipy icon (#281)

Fix
scientific-python/scientific-python-hugo-theme#290.

Author: jarrodmillman

core-projects/scipy.md

@@ -1,11 +1,11 @@
 ---
 title: "SciPy"
-avatar: https://avatars.githubusercontent.com/u/288277
+avatar: https://raw.githubusercontent.com/scipy/archive/main/branding/logos/scipy_logo.svg
 homepage: https://scipy.org
 repository: https://github.com/scipy/scipy
 pypi: https://pypi.org/project/scipy
 libraries-io: https://libraries.io/pypi/scipy
-license: https://github.com/scipy/scipy/blob/master/LICENSE.txt
+license: https://github.com/scipy/scipy/blob/main/LICENSE.txt
 license-type: 3-clause BSD
 contact: rgommers
 ---