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](https://github.com/actions/setup-python/compare/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>

.github/workflows/build.yaml

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 69ae2d3..f035873 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -101,7 +101,7 @@
         run: mkdir -p "${ProtonBuildDir}" "${DispatchBuildDir}" "${InstallPrefix}"
 
       - name: Setup python ${{ env.PythonVersion }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PythonVersion }}
           architecture: x64
@@ -206,7 +206,7 @@
           name: qpid_dispatch_wrk_${{matrix.os}}_${{matrix.buildType}}_${{matrix.runtimeCheck}}_${{matrix.protonGitRef}}
 
       - name: Setup python ${{ env.PythonVersion }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ env.PythonVersion }}
           architecture: x64