fix(deps): update dependency phpdocumentor/reflection-docblock to v5.6.0 #3241

Job	Run time
Lint: API (php-cs-fixer)	41s
Lint: ClientPrint (ESLint)	22s
Tests: API	1m 2s
Lint: e2e (ESLint)	28s
Lint: Frontend (ESLint)	41s
Tests: Frontend	2m 30s
Tests: PDF	36s
Lint: Print (ESLint)	32s
Tests: Print	58s
Tests: End-to-end build / Tests: End-to-end (build job)	32s
Tests: End-to-end run / Tests: End-to-end (chrome)	7m 24s
Tests: End-to-end run / Tests: End-to-end (firefox)	7m 36s
Tests: End-to-end run / Tests: End-to-end (edge)	7m 40s
Finish coveralls report	0s
workflow-success	2s
Send out CI success event	0s
	31m 4s

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