fix: Handle : in version string

Author: anthonyharrison

sbomdiff/spdx_parser.py

@@ -41,7 +41,7 @@ def parse_spdx_tag(self, sbom_file):
                 version = None
                 license = None
             if line_elements[0] == "PackageVersion":
-                version = line_elements[1].strip().rstrip("\n")
+                version = line[16:].strip().rstrip("\n")
                 version = version.split("-")[0]
                 version = version.split("+")[0]
             if line_elements[0] == "PackageLicenseConcluded":