CompatHelper: add new compat entry for PartialFunctions at version 1 for package downstream, (keep existing compat) #498

Job	Run time
Tests (1, Core) / Tests - Core	16m 54s
Tests (1, Downstream) / Tests - Downstream	32m 5s
Tests (1, Python) / Tests - Python	17m 30s
Tests (1, QA) / Tests - QA	14m 10s
Tests (lts, Core) / Tests - Core	10m 58s
Tests (lts, Downstream) / Tests - Downstream	20m 2s
Tests (lts, Python) / Tests - Python	8m 48s
Tests (lts, QA) / Tests - QA	8m 32s
Tests (pre, Core) / Tests - Core	16m 50s
Tests (pre, Downstream) / Tests - Downstream	32m 59s
Tests (pre, Python) / Tests - Python	18m 22s
Tests (pre, QA) / Tests - QA	13m 49s
	3h 30m 59s

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