add floss.fund manifest provenance (python#137529)

ewdurbin · Agent-Hellboy · commit ad5ada859223 · 2025-08-19T15:19:05.000+05:30
ref: https://fundingjson.org/#wellknown
diff --git a/.well-known/funding-manifest-urls b/.well-known/funding-manifest-urls
@@ -0,0 +1 @@
+https://www.python.org/funding.json
