Log Message:
seamonkey: Update to 2.53.20. Large scale cleanup of package.

- Local change: Removed all old patches.

- Additional important security fixes up to Current Firefox 115.19 and
  Thunderbird 115.19 ESR plus many enhancements have been backported.

- Support for all NPAPI plugins like Flash, Java and Silverlight has been
  removed.

See release notes:
https://www.seamonkey-project.org/releases/seamonkey2.53.20/