🐛 ocrd_tesserocr: Use Ubuntu's own tesseract, not alex-p's

Dockerfile-ocrd_tesserocr

@@ -8,8 +8,10 @@ ENV TESSDATA_PREFIX /usr/local/share/tessdata
 
 
 # Install Leptonica and Tesseract.
-RUN add-apt-repository ppa:alex-p/tesseract-ocr && \
+# TODO: Review if alex-p's repo is still necessary on jammy (jammy has 4.1.1,
-    apt-get update && \
+# alex-p has 4.1.3, but not for jammy.)
+# RUN add-apt-repository ppa:alex-p/tesseract-ocr && \
+RUN apt-get update && \
     apt-get install -y \
         tesseract-ocr \
         libtesseract-dev \