Added text/yml as a deprecate of application/xml

[Snowmagedden]

While text/xml and application/xml both use .xml and are different text/xml and both still relevant, text/xml could not be added as a standalone since .xml was already taken by application/xml.
Since application/xml is the more preferred type text/yml was added as a deprecate of application/xml for now.

Perhaps changes are necessary in the future.

Changes

Before:

try_parse(text/xml) -> None

After:

try_parse(text/xml) -> application/xml

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.6%. Comparing base (2b6726e) to head (aa36509).

Additional details and impacted files

@@          Coverage Diff          @@
##            main      #4   +/-   ##
=====================================
  Coverage   98.6%   98.6%           
=====================================
  Files          3       3           
  Lines        741     741           
  Branches       7       7           
=====================================
  Hits         731     731           
  Misses         5       5           
  Partials       5       5           

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