fix: hard-code unknown instead of high

Signed-off-by: Will Murphy <[email protected]>

src/vunnel/providers/debian/parser.py

@@ -354,7 +354,7 @@ def _normalize_json(self, ns_cve_dsalist=None):  # noqa: PLR0912,PLR0915,C901
                             # HACK: when we can represent per-package severity or have a good mechanism
                             # for overriding upstream data, we should take this out.
                             if vid == "CVE-2023-44487":
-                                vuln_record["Vulnerability"]["Severity"] = "High"
+                                vuln_record["Vulnerability"]["Severity"] = "Unknown"
 
                             # add fixedIn
                             skip_fixedin = False