Update actions/setup-python action to v6 (#15)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/build_tests.yml

@@ -23,7 +23,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Setup Python
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install skill

.github/workflows/license_tests.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Setup Python
-        uses: actions/setup-python@v1
+        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

@@ -44,7 +44,7 @@ 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
@@ -73,7 +73,7 @@ jobs:
           ref: dev
 
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
           python-version: '3.14'
 

.github/workflows/sync_tx.yml

@@ -16,7 +16,7 @@ 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
 

.github/workflows/unit_tests.yml

@@ -40,7 +40,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
       - name: Set up python ${{ matrix.python-version }}
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: Install System Dependencies