Submodule doc/wiki fetch fails for HEAD and v2.13.0

[cho-m]

I mentioned this in #394 but creating separate issue. Looks like wiki changes were not pushed causing failures if trying to fetch recursively:

❯ git clone --recurse-submodules https://github.com/evaleev/libint.git
...
fatal: remote error: upload-pack: not our ref d0057dd3e920b01eb969e35656925d6d1cf8c80f
fatal: Fetched in submodule path 'doc/wiki', but it did not contain d0057dd3e920b01eb969e35656925d6d1cf8c80f. Direct fetching of that commit failed.

❯ git ls-remote https://github.com/evaleev/libint.wiki.git
1e603bfe11fe9e9d5a2bdf69030a7e2e863cd28c	HEAD
1e603bfe11fe9e9d5a2bdf69030a7e2e863cd28c	refs/heads/master
38c37e7b098210ce76dfe2909de1b5960fca0db8	refs/heads/v2.2
b888225789f6c3ef22db44de4f1d14b3022a46cd	refs/heads/v2.8.x