Remove Python 3.9 because it is past its EOL (#97)

Author: marco-c

Dockerfile

@@ -4,7 +4,7 @@ FROM quay.io/pypa/manylinux2014_x86_64:latest
 
 ENV PATH /root/.cargo/bin:$PATH
 # Add all supported python versions
-ENV PATH /opt/python/cp39-cp39/bin/:/opt/python/cp310-cp310/bin:/opt/python/cp311-cp311:/opt/python/cp312-cp312/bin:/opt/python/cp313-cp313/bin:$PATH
+ENV PATH /opt/python/cp310-cp310/bin:/opt/python/cp311-cp311:/opt/python/cp312-cp312/bin:/opt/python/cp313-cp313/bin:$PATH
 # Otherwise `cargo new` errors
 ENV USER root
 
@@ -34,13 +34,12 @@ ADD Cargo.* ./
 ADD pyproject.toml ./
 ADD README.md README.md
 
-RUN virtualenv -p python3.9 /venv39 && . /venv39/bin/activate && python -m pip install --no-cache-dir -r requirements-dev.txt && maturin develop && python -m pytest . && rm -r /venv39
 RUN virtualenv -p python3.10 /venv310 && . /venv310/bin/activate && python -m pip install -r requirements-dev.txt && maturin develop && python -m pytest . && rm -r /venv310
 RUN virtualenv -p python3.11 /venv311 && . /venv311/bin/activate && python -m pip install -r requirements-dev.txt && maturin develop && python -m pytest . && rm -r /venv311
 RUN virtualenv -p python3.12 /venv312 && . /venv312/bin/activate && python -m pip install -r requirements-dev.txt && maturin develop && python -m pytest . && rm -r /venv312
 RUN virtualenv -p python3.13 /venv313 && . /venv313/bin/activate && python -m pip install -r requirements-dev.txt && maturin develop && python -m pytest . && rm -r /venv313
 
 ENV RUSTFLAGS="-C target-feature=-crt-static"
-RUN maturin build --target x86_64-unknown-linux-musl --manylinux off --interpreter python3.9 python3.10 python3.11 python3.12 python3.13
+RUN maturin build --target x86_64-unknown-linux-musl --manylinux off --interpreter python3.10 python3.11 python3.12 python3.13
 
-CMD ["maturin", "publish", "--interpreter", "python3.9", "python3.10", "python3.11", "python3.12", "python3.13"]
+CMD ["maturin", "publish", "--interpreter", "python3.10", "python3.11", "python3.12", "python3.13"]

pyproject.toml

@@ -8,7 +8,6 @@ version = "0.4.4"
 classifier = [
     "License :: OSI Approved :: Mozilla Public License 2.0 (MPL 2.0)",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",