Add support for Python 3.13 (#109)

* Drop support for Python 3.8
* Add support for Returns 0.23
* Error on empty coverage artifact upload
* Include hidden files in artifact upload

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
   test:
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout repo
@@ -35,6 +35,8 @@ jobs:
         with:
           name: coverage-${{ matrix.python-version }}
           path: .coverage.*
+          include-hidden-files: true
+          if-no-files-found: error
   coverage:
     needs: test
     runs-on: ubuntu-22.04

noxfile.py

@@ -6,7 +6,7 @@
 options.sessions = ["test", "coverage", "lint"]
 
 
-@session(python=["3.8", "3.9", "3.10", "3.11", "3.12"])
+@session(python=["3.9", "3.10", "3.11", "3.12", "3.13"])
 def test(s: Session):
     s.install(".", "pytest", "pytest-cov", "pytest-timeout")
     s.env["COVERAGE_FILE"] = f".coverage.{s.python}"