Update actions/setup-python action to v6

Author: renovate[bot]

.github/workflows/build_tests.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install Build Tools

.github/workflows/license_tests.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v3
+        uses: actions/setup-python@v6
         with:
           python-version: 3.14
       - name: Install Build Tools

.github/workflows/publish_stable.yml

@@ -24,7 +24,7 @@ jobs:
           ref: dev
           fetch-depth: 0 # otherwise, there would be errors pushing refs to the destination repository.
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v6
         with:
           python-version: 3.14
       - name: Install Build Tools

.github/workflows/release_workflow.yml

@@ -27,7 +27,7 @@ jobs:
           ref: dev
           fetch-depth: 0 # otherwise, there would be errors pushing refs to the destination repository.
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v6
         with:
           python-version: 3.14
       - name: Install Build Tools
@@ -70,7 +70,7 @@ jobs:
           ref: dev
 
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
           python-version: '3.14'