Your Windows password & Google password are no longer linked.
Your Google password can now be changed separately.
If you've forgotten your password, or are locked out of your account, please contact the tech department.
Otherwise your password can be changed while signed in.
In Google Drive/Gmail click on your profile icon in the top right, and click "Manage your Google Account"
On the left, click "Security"
Scroll down, and click on "Password"
Enter your current password, and click "Next"
Enter your new password twice, and click "Change Password"