Update Sphinx version lock; remove Python 3.12 from GitHub Actions workflow.

Author: lapets

.github/workflows/lint-test-cover-docs.yml

@@ -6,7 +6,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
     name: "Python ${{ matrix.python-version }}"
     steps:
       - uses: actions/checkout@v4

pyproject.toml

@@ -20,7 +20,7 @@ Documentation = "https://egcd.readthedocs.io"
 [project.optional-dependencies]
 docs = [
     "toml~=0.10.2",
-    "sphinx~=4.2.0",
+    "sphinx~=5.0",
     "sphinx-rtd-theme~=1.0.0"
 ]
 test = [