Bump `setup-matrix` action to v2 #1468

Job	Run time
🐍 Prepare Python	25s
⬢ Prepare Node.js	17s
🔍 Check if pull request	3s
🧱 Build test matrix	26s
🔍 Check	2m 27s
🧱 Build Spotlight	2m 4s
📝 Build API docs	50s
🗃 Build datasets	1m 53s
🧪 Unit Test	1m 36s
🧪 Doc Test	1m 40s
🧪 UI Test (chrome)	2m 49s
🧪 Integration Test (ubuntu-latest, 3.8)	10m 4s
🧪 UI Test (firefox)	3m 24s
🔍 Check wheel contents	32s
🚀 Release Spotlight	0s
	28m 30s

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