Potential fix for code scanning alert no. 4: Workflow does not contain permissions (#600)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: gijzelaerr

.github/workflows/publish-test-pypi.yml

@@ -7,6 +7,8 @@ jobs:
   build:
     name: Build distribution 📦
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - name: Checkout
         uses: actions/checkout@v6