Upgrade Psalm to ^5

[gsteel]

Closes #200

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.59 🎉

Comparison is base (10bf4bf) 84.00% compared to head (1e3b767) 84.60%.

❗ Current head 1e3b767 differs from pull request most recent head 494184b. Consider uploading reports for the commit 494184b to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##              1.4.x     #223      +/-   ##
============================================
+ Coverage     84.00%   84.60%   +0.59%     
  Complexity      203      203              
============================================
  Files            37       37              
  Lines           619      643      +24     
============================================
+ Hits            520      544      +24     
  Misses           99       99              

Impacted Files	Coverage Δ
src/ResultSet/HydratingResultSetFactory.php	9.52% <ø> (ø)
...dleware/Container/ExpiredPreviewHandlerFactory.php	100.00% <100.00%> (ø)
src/Middleware/Container/PreviewHandlerFactory.php	100.00% <100.00%> (ø)
...rc/Middleware/Container/PrismicTemplateFactory.php	100.00% <100.00%> (ø)
src/Middleware/Container/WebhookHandlerFactory.php	100.00% <100.00%> (ø)
src/ResultSet/Container/TypeMapFactory.php	100.00% <100.00%> (ø)
src/ResultSet/TypeMap.php	100.00% <100.00%> (ø)
src/RouteProvider.php	100.00% <100.00%> (ø)
src/Router/Container/RouteParamsFactory.php	100.00% <100.00%> (ø)

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