Fix MappingListener override in ServiceDiscoveryRegistry

[AlbumenJ]

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
1 Code Smell

90.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #13277 (629e1e5) into 3.2 (6b634b7) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                3.2   #13277      +/-   ##
============================================
- Coverage     69.49%   69.47%   -0.03%     
  Complexity        2        2              
============================================
  Files          1653     1653              
  Lines         68942    68959      +17     
  Branches      10048    10051       +3     
============================================
- Hits          47911    47908       -3     
- Misses        16392    16411      +19     
- Partials       4639     4640       +1     

see 28 files with indirect coverage changes

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