[PHP 8.4] Fixes for implicit nullability deprecation

[andypost]

Fixes #1296

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.97%. Comparing base (fc161a8) to head (ff6cc04).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1297   +/-   ##
=========================================
  Coverage     73.97%   73.97%           
  Complexity     2365     2365           
=========================================
  Files           347      347           
  Lines          7071     7071           
=========================================
  Hits           5231     5231           
  Misses         1840     1840           

Flag	Coverage Δ
8.1	73.97% <100.00%> (ø)
8.2	73.97% <100.00%> (ø)
8.3	73.97% <100.00%> (ø)
8.4	72.84% <100.00%> (ø)

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Files	Coverage Δ
src/API/Baggage/Propagation/BaggagePropagator.php	96.87% <100.00%> (ø)
...c/API/Trace/Propagation/TraceContextPropagator.php	98.11% <100.00%> (ø)
src/Context/Propagation/NoopTextMapPropagator.php	88.88% <100.00%> (ø)
src/SDK/Common/Configuration/Configuration.php	96.47% <100.00%> (ø)

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[andypost]

@brettmc please create a PHP 8.4 compatible release to unblock Drupal upgrade

[brettmc]

Hi @andypost
PHP 8.4 doesn't go GA for a few weeks yet. What's blocking you from installing/running against drupal in the latest 8.4 RC? We run our tests against 8.4rc, and it seems to work excepting deprecations etc in some of the test tools...

[andypost]

@brettmc Thank you, attempted to update packages allowed to get rid of patches! Meantime bikeshedding stuck on dependency on tbachert/spi plugin