allow below-zero temperatures in openmeteo tests

src/clients/weather/openmeteo.spec.ts

@@ -7,8 +7,8 @@ describe('createOpenmeteoClient', () => {
             latitude: 52.28,
             longitude: 10.52,
         });
-        expect(result.apparentTemperature).toMatch(/^\d+(\.?\d+)?°C$/);
-        expect(result.temperature).toMatch(/^\d+(\.?\d+)?°C$/);
+        expect(result.apparentTemperature).toMatch(/^-?\d+(\.?\d+)?°C$/);
+        expect(result.temperature).toMatch(/^-?\d+(\.?\d+)?°C$/);
         expect(result.relativeHumidity).toMatch(/^\d+%$/);
 
         // Just to make sure that the returned weather seems to be reasonable