fix(pt): fix `get_dim` for `DescrptDPA1Compat` #8600

Job	Run time
Test Python (1, 3.8)	25m 46s
Test Python (1, 3.11)	26m 3s
Test Python (2, 3.8)	26m 16s
Test Python (2, 3.11)	23m 26s
Test Python (3, 3.8)	26m 31s
Test Python (3, 3.11)	24m 59s
Test Python (4, 3.8)	25m 16s
Test Python (4, 3.11)	24m 47s
Test Python (5, 3.8)	27m 5s
Test Python (5, 3.11)	24m 38s
Test Python (6, 3.8)	26m 13s
Test Python (6, 3.11)	24m 40s
Combine and update integration test durations (3.8)	57s
Combine and update integration test durations (3.11)	1m 3s
Pass testing Python	2s
	5h 7m 42s

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