Replace leptonica deskew with tesseract find skew and pillow rotate

Also rebuild the cache.

tests/plugins/tesseract_cache.py

@@ -181,6 +181,11 @@ class CacheOcrEngine(TesseractOcrEngine):
         with patch('ocrmypdf._exec.tesseract.run', new=partial(cached_run, options)):
             return TesseractOcrEngine.get_orientation(input_file, options)
 
+    @staticmethod
+    def get_deskew(input_file, options) -> float:
+        with patch('ocrmypdf._exec.tesseract.run', new=partial(cached_run, options)):
+            return TesseractOcrEngine.get_deskew(input_file, options)
+
     @staticmethod
     def generate_hocr(input_file, output_hocr, output_text, options):
         with patch('ocrmypdf._exec.tesseract.run', new=partial(cached_run, options)):

tests/plugins/tesseract_noop.py

@@ -79,6 +79,10 @@ class NoopOcrEngine(OcrEngine):
     def get_orientation(input_file, options):
         return OrientationConfidence(angle=0, confidence=0.0)
 
+    @staticmethod
+    def get_deskew(input_file, options):
+        return 0.0
+
     @staticmethod
     def generate_hocr(input_file, output_hocr, output_text, options):
         with Image.open(input_file) as im, open(