Fix build

Dockerfile

@@ -7,10 +7,10 @@ RUN --mount=type=cache,target=/var/cache,sharing=locked \
     apt-get update \
     && apt-get upgrade --assume-yes \
     && LC_ALL=C apt-get install --assume-yes --no-install-recommends bison \
-        flex python-lxml libfribidi-dev swig \
+        flex python3-lxml libfribidi-dev swig \
         cmake librsvg2-dev colordiff libpq-dev libpng-dev libjpeg-dev libgif-dev libgeos-dev libgd-dev \
         libfreetype6-dev libfcgi-dev libcurl4-gnutls-dev libcairo2-dev libxml2-dev \
-        libxslt1-dev python-dev php-dev libexempi-dev lcov lftp ninja-build git curl \
+        libxslt1-dev python3-dev php-dev libexempi-dev lcov lftp ninja-build git curl \
         clang libprotobuf-c-dev protobuf-c-compiler libharfbuzz-dev libcairo2-dev librsvg2-dev \
     && ln -s /usr/local/lib/libproj.so.* /usr/local/lib/libproj.so