I've never heard that sound before. Closest thing I've heard to that would be from a failing hard drive, but Apple Silicon Macs don't use hard drives, unless you have an external hard drive powered on somewhere nearby. I have heard SSDs make a slight noise, but they are usually very hard to hear so I really doubt this is the case here.
Are you sure the noise is from the laptop? Have you tried moving the laptop to another location to make sure the sound follows the laptop instead of something else in the room making that sound? I can tell you from personal experience some sounds can be hard to track down. I could have sworn a sound was at my desk, but after investigating discovered the sound was from ten feet away.
If you believe the sound is from the laptop, then take the laptop to Apple or an Apple Authorized Service Provider for assistance since the only way to figure it out would be to see & hear the laptop in person.
You can try booting the laptop into Safe Mode which will prevent the automatic launching of third party software during boot & log in. Or maybe just a normal reboot may be sufficient if something got stuck.
