Your lock file does not contain a compatible set of packages. Please run composer update.
symfony/string vx.x.x requires php >=8.2 -> your php version (8.1) does not satisfy that requirement.
Application
Customer
Potential cause
The PHP version of the project is not set correctly.
Solution
Add the PHP_VERSION environment variable to your project through the UI, and set its value to the PHP version that your project uses. This value accepts major and minor versions only, for example, 8.2. For more information, see Modifying environment variables.
Note
Setting the PHP_VERSION variable in the .gitlab-ci.yml file might not work as expected. Acquia recommends that you set variable values through the Code Studio UI.
Code Studio