maint: bump reuse to v3.0.2 in add-license-headers

[klmcadams]

• Changed headers.run() to _annotate.run()
• Removed recursion from check_exists()
• Removed lint_json["non_compliant"]["missing_licenses"] check:
  • This just checks that the license file is located in the LICENSES folder. I think it makes more sense just to check lint_json["non_compliant"]["missing_copyright_info"] and lint_json["non_compliant"]["missing_licensing_info"]. In test_multiple_files, the header was added to the first file, but lint_json["non_compliant"]["missing_licenses"] had the first file as a value even though LICENSES/MIT.txt existed in the repository at that moment. Whenever we added two more files & ran the hook with all three files, then a second SPDX line was added to the first file, which isn't correct.

[RobPasMue]

LGTM! Some minor comments only