Update .github/generate-sbom.py

Co-authored-by: Andrew Murray <3112309+radarhere@users.noreply.github.com>

Author: aclark4life

.github/generate-sbom.py

@@ -391,7 +391,7 @@ def generate(version: str) -> dict:
             "name": "libimagequant",
             "scope": "optional",
             "description": "Improved colour quantization (optional). "
-            "Tested with 2.6-4.4.1. NOTE: GPLv3 licensed.",
+            "Tested with 2.6-4.4.1.",
             "licenses": [{"license": {"id": "GPL-3.0-only"}}],
             "externalReferences": [
                 {"type": "website", "url": "https://pngquant.org/lib/"},