fix(deps): update dependency phpdocumentor/reflection-docblock to v5.6.0 #3242

Job	Run time
Lint: API (php-cs-fixer)	40s
Lint: ClientPrint (ESLint)	26s
Lint: Frontend (ESLint)	32s
Lint: Print (ESLint)	26s
Tests: API	57s
Lint: e2e (ESLint)	31s
Tests: Frontend	2m 21s
Tests: PDF	23s
Tests: Print	1m 0s
Tests: End-to-end build / Tests: End-to-end (build job)	37s
Tests: End-to-end run / Tests: End-to-end (chrome)	7m 23s
Tests: End-to-end run / Tests: End-to-end (firefox)	7m 16s
Tests: End-to-end run / Tests: End-to-end (edge)	7m 22s
Finish coveralls report	0s
workflow-success	3s
Send out CI success event	0s
	29m 57s

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