fix throwing error when linking auth types due to missing sessionToken

[cbaker6]

There was an issue when linking authTypes occurred and an error would be thrown because the sessionToken was missing. The fix is to account for when the server sends/doesn't send a sessionToken. Fix #108

• fixed issue
• adjusted testcases
• added changelog entry
• prepare for version release

[codecov]

Codecov Report

Merging #109 (073b8b0) into main (f3f2244) will increase coverage by 0.02%.
The diff coverage is 100.00%.

❗ Current head 073b8b0 differs from pull request most recent head 1697468. Consider uploading reports for the commit 1697468 to get more accurate results

@@            Coverage Diff             @@
##             main     #109      +/-   ##
==========================================
+ Coverage   81.02%   81.05%   +0.02%     
==========================================
  Files          65       65              
  Lines        5477     5479       +2     
==========================================
+ Hits         4438     4441       +3     
+ Misses       1039     1038       -1     

Impacted Files	Coverage Δ
Sources/ParseSwift/API/Responses.swift	88.57% <ø> (ø)
...Authentication/Protocols/ParseAuthentication.swift	74.43% <100.00%> (+0.39%)	⬆️
Sources/ParseSwift/Objects/ParseUser.swift	81.37% <0.00%> (+0.15%)	⬆️

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