💚(ci) update Github Actions using Node.js 16

Github Actions are transitioning from Node 16 to Node 20. Make sure we use
latest Github Actions versions to clean any deprecation warnings.

The migration is upcoming.

.github/workflows/people.yml

@@ -16,7 +16,7 @@ jobs:
     if: github.event_name == 'pull_request' # Makes sense only for pull requests
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
             fetch-depth: 0
       - name: show
@@ -39,7 +39,7 @@ jobs:
       github.event_name == 'pull_request'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         with:
             fetch-depth: 0
       - name: Check that the CHANGELOG has been modified in the current branch
@@ -49,7 +49,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Check CHANGELOG max line length
         run: |
           max_line_length=$(cat CHANGELOG.md | grep -Ev "^\[.*\]: https://github.com" | wc -L)
@@ -200,7 +200,7 @@ jobs:
       - name: Run e2e tests
         run: cd src/frontend/ && yarn e2e:test
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v4
         if: always()
         with:
           name: playwright-report
@@ -214,7 +214,7 @@ jobs:
         working-directory: src/mail
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install Node.js
         uses: actions/setup-node@v4
         with:
@@ -238,9 +238,9 @@ jobs:
         working-directory: src/backend
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Install Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: '3.10'
       - name: Install development dependencies
@@ -284,7 +284,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
       - name: Create writable /data
         run: |
           sudo mkdir -p /data/media && \
@@ -295,7 +295,7 @@ jobs:
           name: mails-templates
           path: src/backend/core/templates/mail
       - name: Install Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: '3.10'
       - name: Install development dependencies
@@ -313,7 +313,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
         
       - name: Install gettext (required to make messages)
         run: |
@@ -321,7 +321,7 @@ jobs:
           sudo apt-get install -y gettext
       
       - name: Install Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v5
         with:
           python-version: '3.10'