php-composer: update to 1.10.9

1.10.9
* Fixed Bitbucket redirect loop when credentials are outdated
* Fixed GitLab auth prompt wording
* Fixed self-update handling of files requiring admin permissions to write to on Windows (it now does a UAC prompt)
* Fixed parsing issues in funding.yml files

1.10.8
* Fixed compatibility issue with git being configured to show signatures by default
* Fixed discarding of local changes when updating packages to include untracked files
* Several minor fixes

(tpaul)