Replace wfGetDB with MediaWikiServices::getInstance()->getDBLoadBalancer()->getMaintenanceConnectionRef

[paladox]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 81.81818% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.91%. Comparing base (80e1a3e) to head (ac505f7).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
includes/PageSchemas.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #89      +/-   ##
============================================
+ Coverage     74.87%   74.91%   +0.03%     
  Complexity      716      716              
============================================
  Files            36       36              
  Lines          2289     2304      +15     
============================================
+ Hits           1714     1726      +12     
- Misses          575      578       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.