Update php-composer2 to version 2.8.8 / rev 29 via SR 1271833
    
    https://build.opensuse.org/request/show/1271833
    by user pgajdos + anag_factory
    - fix keyring (https://github.com/composer/composer/issues/12009)
    - modified sources
      % php-composer2.keyring
    
    - Update to version 2.8.8
      - Fixed json schema issues with version validation
      - Fixed issues running on 32bit machines
    - Update to version 2.8.7
      - Added COMPOSER_MAX_PARALLEL_PROCESS env var to control max amount of parallel processes Composer will start
      - Added zstd/brotli presence in diagnose command output
      - Fixed error handler to avoid spamming deprecation notices
      - Fixed InstalledVersions returning duplicate data at Composer runtime
      - Fixed handling of --with ... constraints to make them apply to packages replaced a package with a different name
      - Fixed deprecation warnings showing up in IDE code inspections within the vendor dir
      - Fixed a few json schema com