update mqtt client close strategy for main

[suchen-sci]

Same to pr #740

[codecov-commenter]

Codecov Report

Merging #741 (91caa90) into main (7d9f590) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #741      +/-   ##
==========================================
+ Coverage   80.38%   80.46%   +0.07%     
==========================================
  Files          98       98              
  Lines       10701    10702       +1     
==========================================
+ Hits         8602     8611       +9     
+ Misses       1609     1603       -6     
+ Partials      490      488       -2     

Impacted Files	Coverage Δ
pkg/object/mqttproxy/client.go	82.51% <100.00%> (+1.88%)	⬆️
pkg/object/autocertmanager/autocertmanager.go	94.28% <0.00%> (+0.81%)	⬆️
pkg/filters/headerlookup/headerlookup.go	86.01% <0.00%> (+1.39%)	⬆️

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