Lift Python version upper limit

Re spine-tools/Spine-Toolbox#2522

.github/workflows/run_unit_tests.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest, ubuntu-22.04]
-        python-version: [3.8, 3.9, "3.10", 3.11]
+        python-version: [3.8, 3.9, "3.10", 3.11, 3.12]
     steps:
     - uses: actions/checkout@v4
       with:
@@ -41,15 +41,12 @@ jobs:
         PYTHONUTF8: 1
       run: |
         python -m pip install --upgrade pip
-        python -m pip install wheel
         python -m pip install --no-deps -e .
         python -m pip install -r requirements.txt
+        python -m pip install -e .[dev]
     - name: List packages
       run:
         pip list
-    - name: Install coverage
-      run:
-        python -m pip install coverage[toml]
     - name: Run tests
       run: |
         if [ "$RUNNER_OS" != "Windows" ]; then

pyproject.toml

@@ -7,18 +7,12 @@ description = "Spine project items"
 keywords = ["energy system modelling", "workflow", "optimisation", "database"]
 readme = {file = "README.md", content-type = "text/markdown"}
 classifiers = [
-	    "Programming Language :: Python :: 3",
-	    "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
-	    "Operating System :: OS Independent",
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: GNU Lesser General Public License v3 (LGPLv3)",
+    "Operating System :: OS Independent",
 ]
-requires-python = ">=3.8.1, <3.12"
+requires-python = ">=3.8.1"
 dependencies = [
-    "pyside6 >= 6.5.0, != 6.5.3, != 6.6.3",
-    "pyodbc >=4.0",
-    # v1.4 does not pass tests
-    "sqlalchemy >=1.3, <1.4",
-    "pygments >=2.8",
-    "numpy >=1.20.2",
     "spinedb_api>=0.31.1",
     "spine_engine>=0.24.0",
     # "spinetoolbox >=0.6.18",
@@ -27,6 +21,9 @@ dependencies = [
 [project.urls]
 Repository = "https://github.com/spine-tools/spine-items"
 
+[project.optional-dependencies]
+dev = ["coverage[toml]"]
+
 [build-system]
 requires = ["setuptools>=64", "setuptools_scm[toml]>=6.2", "wheel", "build"]
 build-backend = "setuptools.build_meta"
@@ -41,9 +38,9 @@ include-package-data = true
 
 [tool.setuptools.packages.find]
 exclude = [
-	"bin*",
-	"fig*",
-	"tests*",
+    "bin*",
+    "fig*",
+    "tests*",
 ]
 
 [tool.coverage.run]