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] <[email protected]>

Author: dependabot[bot]

.github/workflows/linter.yaml

@@ -14,7 +14,7 @@ jobs:
       - name: Checkout Code
         uses: actions/checkout@v5
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version-file: .python-version
       - name: Install uv

.github/workflows/python-publish.yml

@@ -18,7 +18,7 @@ jobs:
         uses: astral-sh/setup-uv@v6
 
       - name: "Set up Python"
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version-file: "pyproject.toml"
 

.github/workflows/update-a2a-types.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v5
       - name: Set up Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: '3.10'
       - name: Install uv