[CI] Update deprecated actions and commands

Author: JuliaSprenger

.github/workflows/core-test.yml

@@ -35,12 +35,12 @@ jobs:
              numpy-version: '1.20.3'
     steps:
         - name: Set up Python ${{ matrix.python-version }}
-          uses: actions/setup-python@v2
+          uses: actions/setup-python@v4
           with:
             python-version: ${{ matrix.python-version }}
 
         - name: Checkout repository
-          uses: actions/checkout@v2
+          uses: actions/checkout@v3
 
         - name: Install numpy ${{ matrix.numpy-version }}
           run: |

.github/workflows/io-test.yml

@@ -27,11 +27,11 @@ jobs:
     steps:
 
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: Get current year-month
         id: date
-        run: echo "::set-output name=date::$(date +'%Y-%m')"
+        run: echo "date=$(date +'%Y-%m')" >> $GITHUB_OUTPUT
 
       - name: Get ephy_testing_data current head hash
         # the key depend on the last commit repo https://gin.g-node.org/NeuralEnsemble/ephy_testing_data.git