chore: specify python support in pyproject.toml, update ci

* ci test with python 3.8-3.12
* drop 3.7 since it's EOL

.github/workflows/test.yml

@@ -39,7 +39,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        python: ["3.7", "3.8", "3.9", "3.10", "3.11-dev"]
+        python: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 
     steps:
       - name: Checkout code

pyproject.toml

@@ -7,6 +7,20 @@ requires = [
 ]
 build-backend = "setuptools.build_meta"
 
+[project]
+name = "fprettify"
+description = "auto-formatter for modern fortran source code"
+license = {file = "LICENSE"}
+classifiers = [
+    "Programming Language :: Python :: 3 :: Only",
+    "Programming Language :: Python :: 3.8",
+    "Programming Language :: Python :: 3.9",
+    "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
+]
+requires-python = ">=3.8"
+
 [tool.setuptools_scm]
 write_to = "fprettify/_version.py"