d/p/Update-for-dbus-deviation-API-breakage.patch: Fix for newer dbus-deviation

The version of dbus-deviation recently landed in Apertis introduced a minor API break, leading to the error below on projects documenting D-Bus interfaces:

TypeError: cannot concatenate 'str' and 'TypeSignature' objects

This commit cherry-picks the upstream patch at https://github.com/hotdoc/hotdoc_dbus_extension/commit/2bfbbc77c391eb3c5e303e