Deprecate limit handlers using HttpURLConnection

[bitwiseman]

Description

This change completes the deprecation of all classes and methods that use HttpURLConnection.

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[codecov]

Codecov Report

Merging #1298 (8effe61) into main (1535817) will increase coverage by 0.01%.
The diff coverage is 88.77%.

@@             Coverage Diff              @@
##               main    #1298      +/-   ##
============================================
+ Coverage     77.88%   77.89%   +0.01%     
- Complexity     1998     2011      +13     
============================================
  Files           194      197       +3     
  Lines          6209     6217       +8     
  Branches        361      358       -3     
============================================
+ Hits           4836     4843       +7     
- Misses         1159     1160       +1     
  Partials        214      214              

Impacted Files	Coverage Δ
src/main/java/org/kohsuke/github/GitHub.java	81.44% <ø> (ø)
...e/github/extras/okhttp3/OkHttpGitHubConnector.java	84.90% <ø> (+1.08%)	⬆️
...tHubConnectorResponseHttpUrlConnectionAdapter.java	87.69% <37.50%> (-7.14%)	⬇️
...c/main/java/org/kohsuke/github/GitHubResponse.java	90.69% <66.66%> (-4.31%)	⬇️
src/main/java/org/kohsuke/github/GitHubClient.java	90.36% <91.66%> (+0.02%)	⬆️
...ain/java/org/kohsuke/github/AbuseLimitHandler.java	78.94% <100.00%> (+3.94%)	⬆️
...va/org/kohsuke/github/GitHubAbuseLimitHandler.java	100.00% <100.00%> (ø)
...rc/main/java/org/kohsuke/github/GitHubBuilder.java	92.04% <100.00%> (+0.18%)	⬆️
...ke/github/GitHubConnectorResponseErrorHandler.java	100.00% <100.00%> (ø)
...ava/org/kohsuke/github/GitHubRateLimitHandler.java	100.00% <100.00%> (ø)
... and 7 more

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