docker: build-essential no longer needed

Author: effigies

Dockerfile

@@ -90,15 +90,9 @@ RUN apt-get update && \
 # Micromamba
 FROM downloader AS micromamba
 
-# Install a C compiler to build extensions when needed.
-# traits<6.4 wheels are not available for Python 3.11+, but build easily.
-RUN apt-get update && \
-    apt-get install -y --no-install-recommends build-essential && \
-    apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
-
 WORKDIR /
 # Bump the date to current to force update micromamba
-RUN echo "2024.02.06"
+RUN echo "2025.08.18"
 RUN curl -Ls https://micro.mamba.pm/api/micromamba/linux-64/latest | tar -xvj bin/micromamba
 
 ENV MAMBA_ROOT_PREFIX="/opt/conda"