new image python12 and bug fix for all version

docker/Dockerfile

@@ -15,10 +15,6 @@ RUN apt-get update && \
         libjs-jquery-tablesorter \
         texlive-latex-extra \
         dvipng \
-        python3-dev \
-        python3-setuptools \
-        python3-pip \
-        python3-wheel \
         python3-tk \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*

setup.py

@@ -156,7 +156,7 @@ def clean_stale_cmake_cache():
                     recorded_source = os.path.abspath(match.group(1))
                     actual_source = os.path.abspath(".")
                     if recorded_source != actual_source:
-                        print(f"🧹 Detected stale CMake cache (was: {recorded_source})")
+                        print("Detected stale CMake cache (was: {})".format(recorded_source))
                         print("Removing 'build/' to avoid CMake path conflict.")
                         shutil.rmtree("build", ignore_errors=True)