Update symfony dependencies

[staabm]

updated the symfony dependencies and re-created the composer.lock with php 8.1 so the CI 8.1 build no longer errors at composer install:

Run composer install --no-interaction
Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Your lock file does not contain a compatible set of packages. Please run composer update.

  Problem 1
    - symfony/stopwatch is locked to version v7.1.6 and an update of this package was not requested.
    - symfony/stopwatch v7.1.6 requires php >=8.2 -> your php version (8.1.31) does not satisfy that requirement.
  Problem 2
    - php-coveralls/php-coveralls is locked to version v2.7.0 and an update of this package was not requested.
    - php-coveralls/php-coveralls v2.7.0 requires symfony/stopwatch ^2.0 || ^3.0 || ^4.0 || ^5.0 || ^6.0 || ^7.0 -> satisfiable by symfony/stopwatch[v7.1.6].
    - symfony/stopwatch v7.1.6 requires php >=8.2 -> your php version (8.1.31) does not satisfy that requirement.

[staabm]

//cc @shish

[shish]

Looks good to me, though I don't have permission to merge it o.o