Revert "Since PyMuPDF 1.13.3 corrupts text, pin 1.12.5 and work around it"

This reverts commit b0ce7c63dd.

setup.py

@@ -251,7 +251,7 @@ setup(
         'ruffus == 2.6.3',        # pinned - ocrmypdf implements a 2.6.3 workaround
     ],
     extras_require={
-        'fitz': ['PyMuPDF == 1.12.5'],
+        'fitz': ['PyMuPDF >= 1.13.3'],
     },
     tests_require=tests_require,
     entry_points={

src/ocrmypdf/pdfinfo.py

@@ -586,12 +586,7 @@ def _page_get_textblocks(infile, pageno):
     "Smarter text detection"
 
     doc = fitz.Document(infile)
-    if fitz.version[0] >= '1.13.0':
-        text = doc[pageno].getText('dict')
-    else:
-        import json
-        textjson = doc[pageno].getText('json')
-        text = json.loads(textjson)
+    text = doc[pageno].getText('dict')
     if not text:
         return