refactor: use `getsym`/`setsym` over `getu`/`setu` #434

Job	Run time
Tests (1, Core) / Tests - Core	9m 4s
Tests (1, Downstream) / Tests - Downstream	32m 9s
Tests (1, Python) / Tests - Python	8m 43s
Tests (1, QA) / Tests - QA	8m 46s
Tests (lts, Core) / Tests - Core	9m 3s
Tests (lts, Downstream) / Tests - Downstream	29m 8s
Tests (lts, Python) / Tests - Python	8m 9s
Tests (lts, QA) / Tests - QA	6m 46s
Tests (pre, Core) / Tests - Core	8m 51s
Tests (pre, Downstream) / Tests - Downstream	33m 6s
Tests (pre, Python) / Tests - Python	8m 49s
Tests (pre, QA) / Tests - QA	6m 32s
	2h 49m 6s

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