Fix broken workflow yaml

Author: tomwhite

.github/workflows/benchmark.yml

@@ -23,7 +23,7 @@ jobs:
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/setup-python@v2
         with:
-          python-version: ["3.10"]
+          python-version: "3.10"
       - name: Install dependencies
         run: |
           sudo apt update -y

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v2
       with:
-        python-version: ["3.10"]
+        python-version: "3.10"
     - name: Install dependencies
       run: |
         sudo apt update -y