Fix test failure on missing JobContext

tests/test_multiprocessing.py

@@ -15,7 +15,7 @@
 # along with OCRmyPDF.  If not, see <http://www.gnu.org/licenses/>.
 
 from ocrmypdf.pdfinfo import PdfInfo, PageInfo
-from ocrmypdf.pipeline import JobContext, JobContextManager
+from ocrmypdf._jobcontext import JobContext, JobContextManager
 from multiprocessing import Process
 from multiprocessing.managers import BaseProxy
 
@@ -59,4 +59,4 @@ def test_jobcontext_proxy(resources):
     p.join()
     assert p.exitcode == 0, "Child process failed"
 
-    assert context.get_pdfinfo()[0].rotation == 180
+    assert context.get_pdfinfo()[0].rotation == 180