How do I stop getting password notifications from iCloud?
From Apple KB : If your Apple ID is locked

If your Apple ID is locked
If you or someone else enters your password, security questions, or
other account information incorrectly too many times, your Apple ID
automatically locks to protect your security and you can't sign in to
any Apple services. You can unlock your Apple ID after you verify your
identity.
If your Apple ID is locked for security reasons, you might see one of
these alerts:

“This Apple ID has been disabled for security reasons”
&quot;You can't sign in because your account was disabled for security reasons&quot;
&quot;This Apple ID has been locked for security reasons&quot;

When you see one of these alerts, you can go to iforgot.apple.com
to unlock your account with your existing password or to reset your
password. After multiple unsuccessful attempts to unlock your
account, your Apple ID will remain locked and you can try again the
next day.
If you use two-step verification, you need to use your recovery
key and a trusted device. And if you use two-factor
authentication, you need a trusted device or trusted phone number
to unlock your Apple ID.
If you see a message that is different from the alerts above and you
can't reset your password, contact Apple for help.