Add package python-ty

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referencing PRs:
 PR: pool/python-ty!2

.gitmodules

@@ -16870,6 +16870,10 @@
 	path = python-tsk
 	url = ../../pool/python-tsk
 	branch = leap-16.1
+[submodule "python-ty"]
+	path = python-ty
+	url = ../../pool/python-ty
+	branch = leap-16.1
 [submodule "python-unearth"]
 	path = python-unearth
 	url = ../../pool/python-unearth