Bump version `3.0.1+dev` to `3.0.1-a.0` #19212

Job	Run time
📊 Q&A	1m 10s
dispatch	3s
spelling / cspell	23s
docs / Build & Check documentations	28s
python / (🐧 Linux only): 🐍 Python server tests	3m 36s
rust / 🐧 Linux: 🦀 Rust tests	5m 10s
rust / 🍎 macOS: 🦀 Rust tests	3m 1s
rust / 🏁 Windows: 🦀 Rust tests	6m 55s
web / 🌐 Web tests	15m 40s
⭐ CI is happy ⭐	1s
	36m 27s

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