Python: Rename cursor => Cursor in PEP249

Notice that since this will be part of the same PR as 5cfc433, it is OK
to do this change without keeping `PEP249::cursor` for backwards
compatibility.

Author: RasmusWL

python/ql/src/semmle/python/frameworks/PEP249.qll

@@ -28,9 +28,9 @@ deprecated class PEP249ModuleApiNode = PEP249::PEP249ModuleApiNode;
 deprecated module Connection = PEP249::Connection;
 
 /**
- * DEPRECATED: Use `PEP249::cursor` instead.
+ * DEPRECATED: Use `PEP249::Cursor` instead.
  */
-deprecated module cursor = PEP249::cursor;
+deprecated module cursor = PEP249::Cursor;
 
 /**
  * DEPRECATED: Use `PEP249::execute` instead.

python/ql/src/semmle/python/frameworks/internal/PEP249Impl.qll

@@ -78,7 +78,7 @@ module PEP249 {
    * These are are returned by the `cursor` method on a database connection.
    * See https://www.python.org/dev/peps/pep-0249/#cursor.
    */
-  module cursor {
+  module Cursor {
     /**
      * A source of database cursors (following PEP 249), extend this class to model new instances.
      *
@@ -148,7 +148,7 @@ module PEP249 {
    */
   private DataFlow::LocalSourceNode execute(DataFlow::TypeTracker t) {
     t.startInAttr("execute") and
-    result in [cursor::instance(), Connection::instance()]
+    result in [Cursor::instance(), Connection::instance()]
     or
     exists(DataFlow::TypeTracker t2 | result = execute(t2).track(t2, t))
   }