Unable to install any package in laravel after Downloading latest xampp

I recently downloaded the latest xampp and shifted all my project to it. After that I cannot able to install any new packages. I am getting errors

Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Root composer.json requires php ^7.2.5 but your php version (8.0.2) does not satisfy that requirement.
  Problem 2
    - Root composer.json requires laravel/ui 2.4 -> satisfiable by laravel/ui[v2.4.0].
    - laravel/ui v2.4.0 requires php ^7.2.5 -> your php version (8.0.2) does not satisfy that requirement.

I tried different solution like updating composer.json file. by seeing this https://stackoverflow.com/questions/65454412/root-composer-json-requires-php-7-3-but-your-php-version-8-0-0-does-not-satis

"require": {
    "php": "^7.2.5 || ^8.0",
    .....
},

but not working. I need help in solving this issue.

I have tried deleting composer.lock file and then deleted vendor folder and run composer install command. Getting the below error

Problem 1
    - Conclusion: don't install laravel/framework v7.29.0 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.29.1 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.29.2 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.29.3 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.30.0 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.30.1 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.30.2 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.30.3 (conflict analysis result)
    - Conclusion: don't install laravel/framework v7.30.4 (conflict analysis result)
    - illuminate/support[v8.0.0, ..., v8.11.2] require php ^7.3 -> your php version (8.0.2) does not satisfy that requirement.
    - laravel/framework[v7.0.0, ..., v7.28.4] require php ^7.2.5 -> your php version (8.0.2) does not satisfy that requirement.
    - laravel/ui[v3.1.0, ..., 3.x-dev] require illuminate/support ^8.0 -> satisfiable by illuminate/support[v8.0.0, ..., 8.x-dev].
    - Only one of these can be installed: illuminate/support[v5.5.0, ..., 5.8.x-dev, v6.0.0, ..., 6.x-dev, v7.0.0, ..., 7.x-dev, v8.0.0, ..., 8.x-dev], laravel/framework[v7.0.0, ..., 7.x-dev]. laravel/framework replaces illuminate/support and thus cannot coexist with it.
    - Root composer.json requires laravel/framework ^7.0 -> satisfiable by laravel/framework[v7.0.0, ..., 7.x-dev].
    - Root composer.json requires laravel/ui ^3.1.0 -> satisfiable by laravel/ui[v3.1.0, v3.2.0, 3.x-dev].

Thank you