Added sponsors badge and Roboflow there #1983

Job	Run time
Test and lint (ubuntu-latest, 3.8)	2m 59s
Test and lint (ubuntu-latest, 3.9)	5m 36s
Test and lint (ubuntu-latest, 3.10)	4m 45s
Test and lint (ubuntu-latest, 3.11)	4m 49s
Test and lint (ubuntu-latest, 3.12)	5m 26s
Test and lint (windows-latest, 3.8)	5m 19s
Check code formatting with ruff and mypy + tests (3.8)	36s
Test and lint (windows-latest, 3.9)	8m 42s
Test and lint (windows-latest, 3.10)	7m 29s
Test and lint (windows-latest, 3.11)	8m 10s
Check Readme is not outdated (3.8)	27s
Test and lint (windows-latest, 3.12)	7m 59s
Test and lint (macos-latest, 3.8)	4m 9s
Test and lint (macos-latest, 3.9)	8m 47s
Test and lint (macos-latest, 3.10)	6m 42s
Test and lint (macos-latest, 3.11)	12m 40s
Test and lint (macos-latest, 3.12)	8m 22s
	1h 42m 57s

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