dockerfile: Remove tesseract from the base image

tesserocr now ships binary wheels with built in libleptonica/libtesseract, so rely on
these instead of building it on our own.

Depends on Weblate downloading trained data, see WeblateOrg/weblate#9606

Dockerfile

@@ -80,8 +80,6 @@ RUN \
     libmariadb3 \
     libmariadb-dev \
     libxmlsec1-dev \
-    libleptonica-dev \
-    libtesseract-dev \
     libsasl2-dev \
     libldap2-dev \
     libldap-common \
@@ -95,7 +93,6 @@ RUN \
     libcairo-gobject2 \
     gcc \
     g++ \
-    tesseract-ocr \
     patch \
     unzip \
     xz-utils \
@@ -137,8 +134,6 @@ RUN \
     ruby-dev \
     cmake \
     pkg-config \
-    libleptonica-dev \
-    libtesseract-dev \
     libmariadb-dev \
     libgirepository1.0-dev \
     libxml2-dev \