fix: update requestId for Idempotency when resending

[cbaker6]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

When resending requests after an error is thrown from the server, the same requestId is currently used. This can result in the parse-server throwing Duplicate Request when Idempotency is enabled on the server-side.

Approach

When resending a request, update the requestId if a request currently contains a requestId since the original request was already handled by the server.

TODOs before merging

• Add tests
• Add entry to changelog
• Add changes to documentation (guides, repository pages, in-code descriptions)

[codecov]

Codecov Report

Merging #63 (0988b83) into main (9c8f139) will increase coverage by 0.02%.
The diff coverage is 88.88%.

❗ Current head 0988b83 differs from pull request most recent head 04ab720. Consider uploading reports for the commit 04ab720 to get more accurate results

@@            Coverage Diff             @@
##             main      #63      +/-   ##
==========================================
+ Coverage   90.41%   90.44%   +0.02%     
==========================================
  Files         164      164              
  Lines       16513    16521       +8     
==========================================
+ Hits        14931    14942      +11     
+ Misses       1582     1579       -3     

Impacted Files	Coverage Δ
Sources/ParseSwift/Extensions/URLSession.swift	86.26% <80.00%> (-0.12%)	⬇️
Sources/ParseSwift/API/API.swift	99.40% <100.00%> (+0.01%)	⬆️
Sources/ParseSwift/LiveQuery/ParseLiveQuery.swift	75.11% <0.00%> (+0.58%)	⬆️

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