ci: pin mssql server version

[pichlermarc]

Currently containers are failing to initialize - checking to see if this is related to a recent push of the 2017-latest mssql server image.

[pichlermarc]

hmm, maybe something changed with the runners.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.07%. Comparing base (dfb2dff) to head (e7afe90). Report is 242 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2439      +/-   ##
==========================================
+ Coverage   90.97%   97.07%   +6.09%     
==========================================
  Files         146        8     -138     
  Lines        7492      410    -7082     
  Branches     1502       67    -1435     
==========================================
- Hits         6816      398    -6418     
+ Misses        676       12     -664     

see 138 files with indirect coverage changes