Try to run the provided composer require 'drupal/feeds_fetcher_headers:^1.0'
and you get:
Your requirements could not be resolved to an installable set of packages.
Problem 1
- Root composer.json requires drupal/feeds_fetcher_headers ^1.0 -> satisfiable by drupal/feeds_fetcher_headers[1.0.0].
- drupal/feeds_fetcher_headers 1.0.0 requires drupal/core ^8 || ^9 -> found drupal/core[8.0.0, ..., 8.9.20, 9.0.0, ..., 9.5.0] but the package is fixed to 10.0.0 (lock file version) by a partial update and that version does not match. Make sure you list it as an argument for the update command.
Use the option --with-all-dependencies (-W) to allow upgrades, downgrades and removals for packages currently locked to specific versions.
Installation failed, reverting ./composer.json and ./composer.lock to their original content.Closed: duplicate
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Resolved via https://www.drupal.org/project/feeds_fetcher_headers/issues/3297179 📌 Automated Drupal 10 compatibility fixes Fixed