Use the new official MSSQL docker image

[chrzaszcz]

See https://hub.docker.com/_/microsoft-mssql-server

[codecov]

Codecov Report

Merging #3166 (63d802d) into master (20480a5) will increase coverage by 0.32%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3166      +/-   ##
==========================================
+ Coverage   79.91%   80.24%   +0.32%     
==========================================
  Files         396      396              
  Lines       32260    32260              
==========================================
+ Hits        25781    25886     +105     
+ Misses       6479     6374     -105     

Impacted Files	Coverage Δ
src/cassandra/mongoose_cassandra_worker.erl	70.75% <0.00%> (-2.36%)	⬇️
src/http_upload/mod_http_upload.erl	94.56% <0.00%> (-2.18%)	⬇️
src/ejabberd_s2s_out.erl	60.13% <0.00%> (-1.83%)	⬇️
src/domain/service_domain_db.erl	78.12% <0.00%> (-1.57%)	⬇️
...c/global_distrib/mod_global_distrib_server_mgr.erl	76.27% <0.00%> (-0.57%)	⬇️
src/ejabberd_c2s.erl	89.05% <0.00%> (-0.23%)	⬇️
src/pubsub/mod_pubsub.erl	73.17% <0.00%> (-0.06%)	⬇️
src/mod_muc_log.erl	77.77% <0.00%> (ø)
src/mod_muc_room.erl	77.10% <0.00%> (+0.17%)	⬆️
src/pubsub/mod_pubsub_db_rdbms.erl	95.34% <0.00%> (+0.25%)	⬆️
... and 15 more

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[NelsonVides]

Great fix, thanks! 🎉