Update .github/generate-sbom.py

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

Author: aclark4life

.github/generate-sbom.py

@@ -423,7 +423,7 @@ def generate(version: str) -> dict:
             "name": "pybind11",
             "scope": "excluded",
             "description": "C++/Python binding library "
-            "(build-time dependency for PIL._imagingmath).",
+            "(build-time dependency).",
             "licenses": [{"license": {"id": "BSD-3-Clause"}}],
             "externalReferences": [
                 {"type": "website", "url": "https://pybind11.readthedocs.io"},