update-copyright: Bump to version 0.5 (requires Python 3)

Upgrade to match our configuration file.

diff --git a/update-copyright b/update-copyright
index f5629da9158f7f3467d986d51bd1f6ed2204da3a..ae8a4cff9f5cf59f362ef7f263c500d1070c52df 160000 (submodule)
--- a/update-copyright
+++ b/update-copyright
@@ -1 +1 @@
-Subproject commit f5629da9158f7f3467d986d51bd1f6ed2204da3a
+Subproject commit ae8a4cff9f5cf59f362ef7f263c500d1070c52df