fix: relaxed typing of parameter to be compatible with Python < 3.9

Signed-off-by: Paul Horton <phorton@sonatype.com>

Author: madpah

cyclonedx/model/vulnerability.py

@@ -84,7 +84,7 @@ class VulnerabilitySeverity(Enum):
     UNKNOWN = 'Unknown'
 
     @staticmethod
-    def get_from_cvss_scores(scores: tuple[float] = None):
+    def get_from_cvss_scores(scores: tuple = None):
         if type(scores) is float:
             scores = (scores,)