Add verify PHPUnit 12+ on bootstrap.php #31916

Job	Run time
End to end test - e2e/only-option-quote-double-equalnone	22s
End to end test - e2e/applied-rule-return-array-nodes	23s
End to end test - e2e/applied-rule-removed-node	18s
End to end test - e2e/invalid-paths	18s
End to end test - e2e/applied-auto-import	22s
End to end test - e2e/no-parallel-reflection-resolver	21s
End to end test - e2e/applied-polyfill-php80	28s
End to end test - e2e/applied-rule-change-docblock	20s
End to end test - e2e/parallel-custom-config	25s
End to end test - e2e/different-path-over-skip-config	18s
End to end test - e2e/only-option-quote-single	17s
End to end test - e2e/only-option-quote-single-bsdouble	17s
End to end test - e2e/only-option	17s
End to end test - e2e/parallel-reflection-resolver	20s
End to end test - e2e/parallel with space	24s
End to end test - e2e/only-option-quote-single-equalnone	20s
End to end test - e2e/print-new-node	20s
	5m 50s

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