The Issue in The build.gradle file for the package of the dependence file itself.

you have to locate the package pub cache directory than open the package directory

in my case i am using linux os so it is in:-

/root/.pub-cache/hosted/pub.dev/flutter_bluetooth_serial-0.4.0/android/build.gradle

than change the sdk to correct version

for example it was 31

I change it to 34 based on error and it works