dev-python/timebook: Bump to EAPI 6 and distutils-r1

Generated with:

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

diff --git a/dev-python/timebook b/dev-python/timebook
index 882119bf9897057056c3dd2baa87e70fe035eed4..f297c7e42bc6501858a0977a39c37e2d12167d18 160000 (submodule)
--- a/dev-python/timebook
+++ b/dev-python/timebook
@@ -1 +1 @@
-Subproject commit 882119bf9897057056c3dd2baa87e70fe035eed4
+Subproject commit f297c7e42bc6501858a0977a39c37e2d12167d18