Update FUNDING.yml
add NumFOCUS github sponsors button (recurring donations only)
This feature is launching today at GitHub Universe!
Also gave the numfocus.org hosted campaign for Bokeh, in case it helps people feel more secure/legit about the donation link.
cc
# These are supported funding model platforms
-github: # Replace with up to 4 GitHub Sponsors-enabled usernames e.g., [user1, user2]
+github: [numfocus]
patreon: # Replace with a single Patreon username
open_collective: # Replace with a single Open Collective username
ko_fi: # Replace with a single Ko-fi username
tidelift: # Replace with a single Tidelift platform-name/package-name e.g., npm/babel
-custom: https://numfocus.salsalabs.org/donate-to-bokeh/index.html
+custom: https://numfocus.org/donate-to-bokeh
