Psalm Fix

[bobstrecansky]

@lalex's PR this week introduced a Psalm release that caused a test failure.

This fixes the template annotation that (I think) needs to happen to follow Psalm's directives.

Related github issue: vimeo/psalm#5203

[lalex]

@bobstrecansky I've tried to fix psalm error with a hotfix in this branch. At least it passes tests. But CorrelationContext itself is not in specs anymore. It is renamed to Baggage (open-telemetry/opentelemetry-specification#857).

[bobstrecansky]

Yup, my thought process was too fix this and then we can wholesale rename it later. I was planning on finishing this but got roped into oncall duty; will finish this up today

[codecov]

Codecov Report

Merging #253 (32c2b78) into main (96d0feb) will decrease coverage by 0.31%.
The diff coverage is 71.42%.

@@             Coverage Diff              @@
##               main     #253      +/-   ##
============================================
- Coverage     93.25%   92.93%   -0.32%     
- Complexity      410      416       +6     
============================================
  Files            41       42       +1     
  Lines           964      977      +13     
============================================
+ Hits            899      908       +9     
- Misses           65       69       +4     

Impacted Files	Coverage Δ	Complexity Δ
sdk/CorrelationContext.php	96.00% <ø> (ø)	12.00 <0.00> (ø)
sdk/Trace/TracerProvider.php	87.87% <50.00%> (-5.46%)	10.00 <2.00> (+1.00)	⬇️
sdk/Trace/RandomIdGenerator.php	80.00% <80.00%> (ø)	5.00 <5.00> (?)

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[bobstrecansky]

@morrisonlevi @beniamin for review please.