fix: incorrect switch case eval when server response code is 429

[srikanthccv]

While working on tests for http sender I found that it doesn't respect the retry-after for too many requests response. I believe this is a bug.

[codecov[bot]]

Codecov Report

Merging #123 (3a465c0) into main (1a47880) will increase coverage by 1.23%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #123      +/-   ##
==========================================
+ Coverage   74.57%   75.80%   +1.23%     
==========================================
  Files          23       23              
  Lines        1766     1765       -1     
==========================================
+ Hits         1317     1338      +21     
+ Misses        335      319      -16     
+ Partials      114      108       -6     

Impacted Files	Coverage Δ
client/internal/httpsender.go	70.96% <100.00%> (+0.45%)	:arrow_up:
client/internal/receivedprocessor.go	84.28% <0.00%> (+15.00%)	:arrow_up:

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