feat: bump SPM toolchain to 5.5

[cbaker6]

New Pull Request Checklist

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

Issue Description

The Package.swift currently specifies 5.1 as the tool version, preventing the SDK and developers to take advantage of the latest features of the 5.5 toolchain such as DocC and tutorials.

Related issue: #n/a

Approach

Bump the SPM toolchain to 5.5. This will benefit developers using Xcode 13+ as they will be able to access the docs and tutorials when building their apps in Xcode along with those using SPM on Linux, Android, and Windows.

Breaking Change for those developers who want to use ParseSwift 4.0.0+ with < Xcode 13 and depend on the SDK using SPM. These developers should either update their Xcode to 13+ or will need to use Cocoapods or Carthage to depend on the Swift SDK for now on.

TODOs before merging

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

[parse-github-assistant]

Thanks for opening this pull request!

• 🎉 We are excited about your hands-on contribution!

[codecov]

Codecov Report

Merging #326 (923b651) into main (7cbf97b) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
- Coverage   85.02%   84.99%   -0.04%     
==========================================
  Files         114      114              
  Lines       12048    12048              
==========================================
- Hits        10244    10240       -4     
- Misses       1804     1808       +4     

Impacted Files	Coverage Δ
Sources/ParseSwift/Objects/ParseObject.swift	81.98% <0.00%> (-0.31%)	⬇️
Sources/ParseSwift/Objects/ParseUser.swift	82.43% <0.00%> (-0.19%)	⬇️
Sources/ParseSwift/LiveQuery/ParseLiveQuery.swift	73.52% <0.00%> (-0.15%)	⬇️
Sources/ParseSwift/Types/ParseAnalytics.swift	98.72% <0.00%> (+0.63%)	⬆️

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