GH-44430: [CI][Swfit] Use setup-python to use "pip install" (#44431)

### Rationale for this change

We can't use `pip install` with Ubuntu 24.04's Python.

### What changes are included in this PR?

Use `actions/setup-python` instead of Ubuntu 24.04's Python.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #44430

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

.github/workflows/swift.yml

@@ -58,6 +58,10 @@ jobs:
  with:
  fetch-depth: 0
  submodules: recursive
+ - name: Setup Python on hosted runner
+ uses: actions/setup-python@f677139bbe7f9c59b41e40162b753c062f5d49a3 # v5.2.0
+ with:
+ python-version: 3
  - name: Setup Archery
  run: pip install -e dev/archery[docker]
  - name: Execute Docker Build