Update to Python 3.10 and switch to pip-tools

.github/workflows/CI.yml

@@ -31,11 +31,12 @@ jobs:
       - name: Set up Python
         uses: actions/setup-python@v5
         with:
-          python-version: '3.9'
+          python-version: '3.10'
           cache: 'pip'
 
       - name: Install dependencies
         run: |
+          sudo apt-get update
           sudo apt-get -y install libxml2-dev libxslt-dev libxslt1-dev python3-dev python3-lxml libxml2-utils
           python -m pip install --upgrade pip setuptools wheel
           python -m pip install -r requirements.txt

requirements.in

@@ -0,0 +1,2 @@
+lxml
+flake8

requirements.txt

@@ -1,2 +1,16 @@
+#
+# This file is autogenerated by pip-compile with Python 3.10
+# by the following command:
+#
+#    pip-compile
+#
+flake8==7.0.0
+    # via -r requirements.in
 lxml==5.1.0
-flake8==7.0.0
+    # via -r requirements.in
+mccabe==0.7.0
+    # via flake8
+pycodestyle==2.11.1
+    # via flake8
+pyflakes==3.2.0
+    # via flake8