GH-42197: [CI][Packaging][Java] Ensure updating "python@*" formulae o…

…n macOS (#42202)

### Rationale for this change

macOS GitHub Actions runners have Python not installed by Homebrew at `/usr/local/`.
If we install `python@ XXX` Homebrew formula, it tries to overwrite `/usr/local/bin/2to3` and so on and causes a conflict error.

NOTE: This is happen only when pre-installed Homebrew `python@ XXX` on macOS GitHub Actions runners is outdated. (`python@ XXX` is updated after macOS GitHub Actions runner image is created.)

### What changes are included in this PR?

Ensure updating `pythone@ XXX` with `--overwrite` before we use `brew bundle`.
`brew bundle` may update `python@ XXX` automatically without `--overwrite`.

FYI: `brew bundle --force ...` will also work.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* GitHub Issue: #42197

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

dev/tasks/java-jars/github.yml

@@ -108,6 +108,18 @@ jobs:
           # llvm@14 because llvm is newer than llvm@14.
           brew uninstall llvm || :
 
+          # Ensure updating python@XXX with the "--overwrite" option.
+          # If python@XXX is updated without "--overwrite", it causes
+          # a conflict error. Because Python 3 installed not by
+          # Homebrew exists in /usr/local on GitHub Actions. If
+          # Homebrew's python@XXX is updated without "--overwrite", it
+          # tries to replace /usr/local/bin/2to3 and so on and causes
+          # a conflict error.
+          brew update
+          for python_package in $(brew list | grep python@); do
+            brew install --overwrite ${python_package}
+          done
+
           brew bundle --file=arrow/cpp/Brewfile
           # We want to link aws-sdk-cpp statically but Homebrew's
           # aws-sdk-cpp provides only shared library. If we have