Revert "Update CI matrix to run v4 subfolder separately"

This reverts commit 36db4e9.

Author: VeckoTheGecko

.github/workflows/ci.yml

@@ -18,21 +18,18 @@ defaults:
 
 jobs:
   unit-test:
-    name: "py${{ matrix.python-version }} | ${{ matrix.os }} | unit tests (${{ matrix.test-subfolder }})"
+    name: "py${{ matrix.python-version }} | ${{ matrix.os }} | unit tests"
     runs-on: ${{ matrix.os }}-latest
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu] #, mac, windows] # TODO v4: Re-enable windows and mac
-        test-subfolder: ["/"]
+        os: [macos] #, mac, windows] # TODO v4: Re-enable windows and mac
         python-version: ["3.12"]
         include:
           - os: ubuntu
             python-version: "3.11"
-            test-subfolder: "/"
           - os: ubuntu
             python-version: "3.12"
-            test-subfolder: "/v4"
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -43,7 +40,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Unit test
         run: |
-          coverage run -m pytest -v -s --html=${{ matrix.os }}_${{ matrix.python-version }}_unit_test_report.html --self-contained-html tests${{ matrix.test-subfolder }}
+          coverage run -m pytest -v -s --html=${{ matrix.os }}_${{ matrix.python-version }}_unit_test_report.html --self-contained-html tests
           coverage xml
       - name: Codecov
         uses: codecov/codecov-action@v5.3.1