ci: bump actions/setup-python from 5 to 6 (#814)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-pypi.yml

@@ -57,7 +57,7 @@ jobs:
 
       - name: "Set up Python"
         id: setup_python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.12'
           cache: 'pip'

.github/workflows/tests.yml

@@ -63,7 +63,7 @@ jobs:
           ref: "${{ env.GITHUB_SHA }}"
 
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.10'