sponsors: LambdaTest is now TestMu AI #1857

Job	Run time
Verify dev env	10s
Check types using supported type checkers	17s
Build & verify package	18s
Tests on pypy-3.10	28s
Run doctests & render changelog	19s
Tests & Mypy on 3.14	1m 13s
Tests & Mypy on 3.11	54s
Tests & Mypy on 3.10	1m 2s
Tests & Mypy on 3.13	58s
Tests & Mypy on 3.12	58s
Tests & Mypy on 3.9	37s
Combine & check coverage	10s
required-checks-pass	5s
	7m 29s

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