Tests

Add Julia ecosystem to Dependabot configuration #242

Job	Run time
Tests (1, Core) / Tests - Core	6m 30s
Tests (1, Downstream) / Tests - Downstream	1m 13s
Tests (lts, Core) / Tests - Core	5m 39s
Tests (lts, Downstream) / Tests - Downstream	10m 45s
Tests (pre, Downstream) / Tests - Downstream	12m 30s
Tests (pre, Core) / Tests - Core	6m 36s
	43m 13s

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