chore(deps): bump the github-actions group across 1 directory with 2 updates

Bumps the github-actions group with 2 updates in the / directory: [actions/checkout](https://github.com/actions/checkout) and [peter-evans/create-pull-request](https://github.com/peter-evans/create-pull-request).


Updates `actions/checkout` from 5 to 6
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

Updates `peter-evans/create-pull-request` from 7 to 8
- [Release notes](https://github.com/peter-evans/create-pull-request/releases)
- [Commits](peter-evans/create-pull-request@v7...v8)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
- dependency-name: peter-evans/create-pull-request
  dependency-version: '8'
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/linter.yaml

@@ -12,7 +12,7 @@ jobs:
     if: github.repository == 'a2aproject/a2a-python'
     steps:
       - name: Checkout Code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:

.github/workflows/python-publish.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install uv
         uses: astral-sh/setup-uv@v7

.github/workflows/unit-tests.yml

@@ -39,7 +39,7 @@ jobs:
         python-version: ['3.10', '3.13']
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up test environment variables
         run: |
           echo "POSTGRES_TEST_DSN=postgresql+asyncpg://a2a:a2a_password@localhost:5432/a2a_test" >> $GITHUB_ENV

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

@@ -12,7 +12,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Python
         uses: actions/setup-python@v6
         with:
@@ -42,7 +42,7 @@ jobs:
           uv run scripts/grpc_gen_post_processor.py
           echo "Buf generate finished."
       - name: Create Pull Request with Updates
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@v8
         with:
           token: ${{ secrets.A2A_BOT_PAT }}
           committer: a2a-bot <a2a-bot@google.com>