pygolang: v↑ (0.0.8 -> 0.0.9)

This upgrade fixes deadlock when new context is created from
already-canceled parent[1]. It also comes with other minor enhancements
and fixes needed e.g. for `zodb restore`[2].

[1] nexedi/pygolang@58d4cbfe
[2] https://pypi.org/project/pygolang/#pygolang-change-history

component/pygolang/buildout.cfg

@@ -50,4 +50,4 @@ scripts = ${:interpreter}
 
 
 [versions]
-pygolang = 0.0.8
+pygolang = 0.0.9