upgrade psalm to v5

[brettmc]

upgrade to the latest version of psalm, and fix/suppress all of the new issues it identifies.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.62%. Comparing base (f798bb6) to head (9b5ce5a).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1246   +/-   ##
=========================================
  Coverage     84.62%   84.62%           
  Complexity     2136     2136           
=========================================
  Files           284      284           
  Lines          6054     6054           
=========================================
  Hits           5123     5123           
  Misses          931      931           

Flag	Coverage Δ
8.0	84.57% <100.00%> (ø)
8.1	84.60% <100.00%> (ø)
8.2	84.60% <100.00%> (ø)
8.3	84.60% <100.00%> (ø)
8.4	84.60% <100.00%> (ø)

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Files	Coverage Δ
src/API/Baggage/Propagation/Parser.php	100.00% <ø> (ø)
src/API/Behavior/Internal/LogWriter/Formatter.php	100.00% <ø> (ø)
src/Context/ContextKey.php	100.00% <ø> (ø)
src/Contrib/Grpc/GrpcTransportFactory.php	71.62% <ø> (ø)
src/SDK/Common/Attribute/Attributes.php	100.00% <ø> (ø)
src/SDK/Common/Configuration/Parser/MapParser.php	94.44% <ø> (ø)
src/SDK/Common/Exception/StackTraceFormatter.php	0.00% <ø> (ø)
src/SDK/Common/Export/Http/PsrTransport.php	94.44% <ø> (ø)
src/SDK/Common/Export/Http/PsrUtils.php	92.42% <ø> (ø)
src/SDK/Common/Future/ErrorFuture.php	100.00% <ø> (ø)
... and 7 more

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