Remove unnecessary use of @available(…) for OutputFormatting.sortedKeys

[regexident]

No description provided.

[codecov]

Codecov Report

Merging #53 into master will decrease coverage by 0.06%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
- Coverage   56.24%   56.18%   -0.07%     
==========================================
  Files          30       30              
  Lines        1433     1431       -2     
==========================================
- Hits          806      804       -2     
  Misses        627      627

Impacted Files	Coverage Δ
Sources/XMLCoder/Encoder/XMLEncoder.swift	47.57% <ø> (ø)	⬆️
Sources/XMLCoder/Auxiliaries/XMLElement.swift	94.3% <100%> (-0.1%)	⬇️

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[MaxDesiatov]

thanks for the PR @regexident, sorry for the delay with reviews of other PRs. I was focused on a different project during the last few weeks and was also waiting until XMLCoder overall has better test coverage before reviewing and merging more disruptive PRs. All PRs that increase the test coverage are welcome and I assume can be reviewed and merged quite quickly.

[MaxDesiatov]

@regexident please don't consider the previous comment as discouraging against substantial improvements, it only means that those will need more time to review and discuss, and I will get to those in the next few weeks anyway.