Upgrade Skopeo from 1.2.3 to 1.9.3

Summary

This updates the bundled Skopeo binary from version 1.2.3 to 1.9.3 in the fetchcode_container plugin.

Related to aboutcode-org/scancode.io#1696

Changes

• Updated build.sh to use skopeo-1.9.3
• Added skopeo-1.9.3.tar.gz to lib-src/
• Added corresponding .ABOUT file for version 1.9.3
• Rebuilt and updated the bundled Skopeo binary

Testing

• Built successfully in a Linux (WSL Ubuntu) environment
• Verified the binary runs correctly:

skopeo version 1.9.3

Notes

• Newer Skopeo versions require additional system dependencies during build:

  • libgpgme-dev
  • libdevmapper-dev
  • pkg-config

• No changes were made to install these dependencies automatically; they are expected to be available in the build environment

Impact

• Updates an outdated Skopeo version (1.2.3 to 1.9.3)
• Improves compatibility with modern container images
• Addresses the concern raised in the linked ScanCode.io issue

Please let me know if a newer Skopeo version is preferred or if additional adjustments are needed.