Add pip install --retries 3 to CI to resolve transients

Signed-off-by: Glenn Jocher <glenn.jocher@ultralytics.com>

.github/workflows/ci-testing.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Install requirements
         run: |
           python -m pip install --upgrade pip wheel
-          pip install -r requirements.txt coremltools openvino-dev "tensorflow-cpu<2.15.1" --extra-index-url https://download.pytorch.org/whl/cpu
+          pip install --retries 3 -r requirements.txt coremltools openvino-dev "tensorflow-cpu<2.15.1" --extra-index-url https://download.pytorch.org/whl/cpu
           yolo checks
           pip list
       - name: Benchmark DetectionModel
@@ -69,9 +69,9 @@ jobs:
         run: |
           python -m pip install --upgrade pip wheel
           if [ "${{ matrix.torch }}" == "1.8.0" ]; then
-              pip install -r requirements.txt torch==1.8.0 torchvision==0.9.0 --extra-index-url https://download.pytorch.org/whl/cpu
+              pip install --retries 3 -r requirements.txt torch==1.8.0 torchvision==0.9.0 --extra-index-url https://download.pytorch.org/whl/cpu
           else
-              pip install -r requirements.txt --extra-index-url https://download.pytorch.org/whl/cpu
+              pip install --retries 3 -r requirements.txt --extra-index-url https://download.pytorch.org/whl/cpu
           fi
         shell: bash # for Windows compatibility
       - name: Check environment