dns/dnsmasq-devel: update to v2.86test4

Changes, taken from upstream Git log
(all by Simon Kelley, upstream maintainer):

* 66b863c 2021-06-26 | Fix problem with re-allocation of serverarray.
* c9efe8e 2021-06-26 | Rationalise domain parsing for --rev-server and --domain.
* d515223 2021-06-26 | Don't re-use datastructures for --address and --local.
*   b908f43 2021-06-26 | Merge branch 'extended-error'
|\
| * 6261aba 2021-06-26 | Initial implementation of RFC-8914 extended DNS errors.
| * 11c52d0 2021-06-21 | Initial changes for extended DNS error codes.
* 85bc753 2021-06-25 | Rationalise --server parsing and datastructure building.
* 1b30fd1 2021-06-25 | Merge branch 'master' of ssh://thekelleys.org.uk/var/local/git/dnsmasq
* 8c9196b 2021-06-24 | Correct domain search algorithm.