try to fix tests

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

@@ -307,10 +307,10 @@ tests:
       OUTPUT:
         name: expected/airportsvoronoidiagram.gml
         type: vector
+        pk: ID
         compare:
           geometry:
             precision: 2
-        pk: id
 
   - algorithm: native:explodelines
     name: Explode lines

src/analysis/processing/qgsalgorithmconcavehull.cpp

@@ -165,7 +165,7 @@ QVariantMap QgsConcaveHullAlgorithm::processAlgorithm( const QVariantMap &parame
       toDelete << edgesIt.key();
     }
 
-    edgesIt++;
+    ++edgesIt;
     i++;
     multiStepFeedback.setProgress( i * step );
   }

src/analysis/processing/qgsalgorithmvoronoipolygons.cpp

@@ -34,7 +34,7 @@ QString QgsVoronoiPolygonsAlgorithm::displayName() const
 
 QStringList QgsVoronoiPolygonsAlgorithm::tags() const
 {
-  return QObject::tr( "voronoi,polygons,tesselation,diagram" ).split( ',' );
+  return QObject::tr( "voronoi,polygons,tessellation,diagram" ).split( ',' );
 }
 
 QString QgsVoronoiPolygonsAlgorithm::group() const