notmuch-addrlookup: 7 -> 9

This version bump contains the following fixes:

v8:
 - Avoid a segmentation fault when notmuch_message_get_header() returns NULL. (Patch by Víctor M. Jáquez <vjaquez@igalia.com>).

v9:
 - Do not use the deprecated notmuch_query_count_messages_st function when using Notmuch 0.25. (Patch by Adam Ruzicka <a.ruzicka@outlook.com>.)
   We already had this patch in our tree.
 - Fix crash in when running queries and the program is build with Notmuch 0.25. (Patch by Joshua Krusell <joshua.krusell@v-dem.net>).
 - Fix conditional compilation when using Notmuch 0.25. (Patch by David Bremner <bremner@debian.org>).