Fix some more processing alg tests

python/plugins/processing/tests/testdata/qgis_algorithm_tests3.yaml

@@ -1315,6 +1315,12 @@ tests:
         compare:
           fields:
             fid: skip
+            date:
+              cast: str
+            min:
+              cast: str
+            max:
+              cast: str
 
   - algorithm: native:joinattributesbylocation
     name: Join by location (intersects)
@@ -1812,6 +1818,10 @@ tests:
         compare:
           fields:
             fid: skip
+            date_min:
+              cast: str
+            date_max:
+              cast: str
 
   - algorithm: qgis:joinbylocationsummary
     name: Join by summary polys to points, reprojected

python/plugins/processing/tests/testdata/qgis_algorithm_tests4.yaml

@@ -177,6 +177,8 @@ tests:
           fields:
             photo: skip
             directory: skip
+            timestamp:
+              cast: str
 
   - algorithm: qgis:concavehull
     name: Concave Hull - Points (0.3)
@@ -1492,7 +1494,10 @@ tests:
           fields:
             sum:
               cast: float
-              precision: 5
+              precision: -1
+            mean:
+              cast: float
+              precision: 3
 
   - algorithm: native:antimeridiansplit
     name: Antimeridian split, lines