Remove psalm

[dmohns]

Brief summary of the change made

Temporarily remove psalm to be able to resolve some dependency conflicts around nikic/php-parser.

phpunit/php-code-coverage 9.2.31  requires nikic/php-parser (^4.18 || ^5.0) 
psy/psysh                 v0.12.4 requires nikic/php-parser (^5.0 || ^4.0)  
sebastian/complexity      2.0.3   requires nikic/php-parser (^4.18 || ^5.0) 
sebastian/lines-of-code   1.0.4   requires nikic/php-parser (^4.18 || ^5.0) 

Are there any other side effects of this change that we should be aware of?

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