dev-python/pyassuan: Bump to EAPI 6, git-r3, and distutils-r1

Generated with:

  $ git submodule update --remote dev-python/pyassuan

diff --git a/dev-python/pyassuan b/dev-python/pyassuan
index 6e4f16aaa6377e30b5c8057e354aaaf6565850f8..e82625e57ced3591b2e3c412d5dea0449cb80fe6 160000 (submodule)
--- a/dev-python/pyassuan
+++ b/dev-python/pyassuan
@@ -1 +1 @@
-Subproject commit 6e4f16aaa6377e30b5c8057e354aaaf6565850f8
+Subproject commit e82625e57ced3591b2e3c412d5dea0449cb80fe6