A batch file to update android sdk platform-tools and build-tools for specific Unity Version. Credit - @skdev3

update-unity-sdk.bat

set UNITY_VERSION=%1%

c:
set JAVA_HOME=c:\Program Files\Unity\Hub\Editor\%UNITY_VERSION%\Editor\Data\PlaybackEngines\AndroidPlayer\OpenJDK\
set ANDROID_HOME=c:\Program Files\Unity\Hub\Editor\%UNITY_VERSION%\Editor\Data\PlaybackEngines\AndroidPlayer\
cd %ANDROID_HOME%SDK\tools\bin\
echo.> %USERPROFILE%\.android\repositories.cfg
 
cmd /C sdkmanager --update
cmd /C sdkmanager "platform-tools" "platforms;android-29"
cmd /C sdkmanager "platform-tools" "platforms;android-30"
cmd /C sdkmanager "platform-tools" "platforms;android-31"
cmd /C sdkmanager "build-tools;30.0.0"

Note - To run, you must open CMD with Administrator privilege.