meson: fix missing deps for technical articles

We need an explicit `depends: documentation_deps` so that all of our
Documentation targets know they require asciidoc.conf. This shows up
as parallel build failures with it not yet being available.

Other targets look OK already.

Signed-off-by: Sam James <sam@gentoo.org>
Acked-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/technical/meson.build

@@ -60,6 +60,7 @@ foreach article : api_docs + articles
     command: asciidoc_html_options,
     input: article,
     output: fs.stem(article) + '.html',
+    depends: documentation_deps,
     install: true,
     install_dir: get_option('datadir') / 'doc/git-doc/technical',
   )