Add new pytest versions to CI

- always use current pip to avoid annotation errors

.github/workflows/testsuite.yml

@@ -63,8 +63,9 @@ jobs:
 
     - name: Install dependencies
       run: |
-        pip install setuptools wheel
-        pip install -r requirements.txt
+        python -m pip install --upgrade pip
+        python -m pip install setuptools wheel
+        python -m pip install -r requirements.txt
     - name: Run unit tests without extra packages as non-root user
       run: |
         export TEST_REAL_FS=1
@@ -109,7 +110,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
         python-version: ["3.9"]
-        pytest-version: [3.0.0, 3.5.1, 4.0.2, 4.5.0, 5.0.1, 5.4.3, 6.0.2, 6.2.5, 7.0.1, 7.1.3, 7.2.0, 7.3.1, 7.4.0]
+        pytest-version: [3.0.0, 3.5.1, 4.0.2, 4.5.0, 5.0.1, 5.4.3, 6.0.2, 6.2.5, 7.0.1, 7.4.4, 8.0.2, 8.1.2, 8.2.0]
     steps:
       - uses: actions/checkout@v4
       - name: Set up Python ${{ matrix.python-version }}
@@ -118,12 +119,13 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          pip install -r requirements.txt
-          pip install -U pytest==${{ matrix.pytest-version }}
-          pip install opentimelineio pandas parquet pyarrow
-          pip install -e .
+          python -m pip install --upgrade pip
+          python -m pip install -r requirements.txt
+          python -m pip install -U pytest==${{ matrix.pytest-version }}
+          python -m pip install opentimelineio pandas parquet pyarrow
+          python -m pip install -e .
           if [[ '${{ matrix.pytest-version }}' == '4.0.2' ]]; then
-             pip install -U attrs==19.1.0
+             python -m pip install -U attrs==19.1.0
           fi
         shell: bash
       - name: Run pytest tests