sponsors: update URL #1870

Job	Run time
Check types using supported type checkers	22s
Verify dev env	12s
Build & verify package	24s
Tests & Mypy on 3.11	56s
Tests & Mypy on 3.12	1m 5s
Tests & Mypy on 3.9	38s
Tests on pypy-3.10	24s
Tests & Mypy on 3.10	1m 10s
Tests & Mypy on 3.13	1m 0s
Tests & Mypy on 3.14	1m 8s
Run doctests & render changelog	21s
Combine & check coverage	15s
required-checks-pass	4s
	7m 59s

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