Update php-composer2 to version 2.3.8 / rev 13 via SR 986327
    
    https://build.opensuse.org/request/show/986327
    by user guoyunhe + dimstar_suse
    - Update to version 2.3.8
      * Fixed support for cache-read-only where the filesystem is not writable (#10906)
      * Fixed type error when using allow-plugins: true (#10909)
      * Fixed @putenv scripts receiving arguments passed to the command (#10846)
      * Fixed support for spaces in paths with binary proxies on Windows (#10836)
      * Fixed type error in GitDownloader if branches cannot be listed (#10888)
      * Fixed RootPackageInterface issue on PHP 5.3.3 (#10895)
      * Fixed type errors (#10904, #10897)