Fix cvss regex

Author: andrew

lib/git/pkgs/models/vulnerability.rb

@@ -162,7 +162,7 @@ def self.normalize_severity(severity)
         def self.parse_cvss_score(vector)
           return nil unless vector
 
-          if vector.match?(/^\d+\.?\d*$/)
+          if vector.match?(/\A\d+(\.\d+)?\z/)
             return vector.to_f
           end