Add union type to suppress deprecation warning

[mxr576]

Closes #323

[codecov]

Codecov Report

Merging #324 (e7f67df) into 3.x (bf77952) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##                3.x     #324      +/-   ##
============================================
- Coverage     87.60%   87.60%   -0.01%     
  Complexity     1749     1749              
============================================
  Files           349      349              
  Lines          4705     4704       -1     
============================================
- Hits           4122     4121       -1     
  Misses          583      583              

Flag	Coverage Δ
unittests	87.60% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...tpClient/Plugin/RetryOauthAuthenticationPlugin.php	100.00% <100.00%> (ø)

[mxr576]

🤔 ...

$ vendor/vimeo/psalm/psalm --config=psalm.xml.dist --show-info=false --stats
Warning: "findUnusedBaselineEntry" will default to "true" in Psalm 6. You should explicitly enable or disable this setting.
Warning: "findUnusedCode" will default to "true" in Psalm 6. You should explicitly enable or disable this setting.
Warning: "findUnusedBaselineEntry" will default to "true" in Psalm 6. You should explicitly enable or disable this setting.
Warning: "findUnusedCode" will default to "true" in Psalm 6. You should explicitly enable or disable this setting.
Target PHP version: 8.1 (inferred from composer.json) (unsupported extensions: reflection).
Scanning files...
Analyzing files...



------------------------------
                              
       No errors found!       
                              
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937 other issues found.
You can display them with --show-info=true
------------------------------

Checks took 0.13 seconds and used 15.467MB of memory
No files analyzed
Psalm was able to infer types for 93.0589% of the codebase
-----------------

[mxr576]

I do not know why I could not reproduce the issue locally but I managed to fix it... 💯 :D

[divya-intelli]

LGTM

[divya-intelli]

vendor/vimeo/psalm/psalm --config=psalm.xml.dist --show-info=false --stats

Thank you @mxr576 for the fix, I was locally able to replicate the psalm error and the fix looks good.