fix: "or-later" suffix updated to consider deprecated "+" operator (#1907)

* fix: or-later suffix has been updated to consider deprecated +

If a given license has the suffix "or-later" it previously could have
been considered or represented with a "+". Example "GFDL-1.0-or-later"
could have been represented as "GFDL-1.0+". This PR allows the license
list generation to consider "or-later" as == to "+" when generating
permutations for upgrading deprecated licenses.

---------

Signed-off-by: Christopher Phillips <christopher.phillips@anchore.com>

internal/spdxlicense/generate/license_test.go

@@ -94,6 +94,9 @@ func TestLicensePermutations(t *testing.T) {
 				"gpl3orlater",
 				"gpl3.0orlater",
 				"gpl3.0.0orlater",
+				"gpl3.0.0+",
+				"gpl3.0+",
+				"gpl3+",
 			},
 		},
 		{