fix typo

Author: passscoed

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ jobs:
           python-version: ${{ matrix.python-version }}
       - name: Install dependencies
         run: |
-          python -m pip instll --upgrade pip
+          python -m pip install --upgrade pip
           pip install pyNFFT3
           pip install numpy
           pip install scipy