chore(deps): bump actions/setup-python from 5 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/node_mainnet_tx_count_per_epoch.yaml

@@ -18,7 +18,7 @@ jobs:
           path: cardano_node_tests
           ref: sync_tests
       - name: setup Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.8
       - name: install dependencies

.github/workflows/node_sync_test.yaml

@@ -64,8 +64,8 @@ jobs:
         with:
           path: cardano_node_tests
           ref: sync_tests
-      - name: run actions/setup-python@v5
-        uses: actions/setup-python@v5
+      - name: run actions/setup-python@v6
+        uses: actions/setup-python@v6
         with:
           python-version: 3.8
       - name: install dependencies

.github/workflows/repo_tests.yaml

@@ -16,7 +16,7 @@ jobs:
       uses: actions/checkout@v5
     - name: Set up python
       id: setup-python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: '3.11'
     - name: Install Poetry