Update the Python package scripts to use Python 3.10 explicitly.

Failure:

1. From the build scripts:

```
+ ./tools/build_pip_package.sh
Python 3.8.10
```

2. But `tensorflow-probability` does not support Python 3.8, https://pypi.org/project/tensorflow-probability/

The fix is to update TFP build scripts to use Python 3.10 explicitly because it appears there are unsupported version of Python on the build machines.

PiperOrigin-RevId: 572339377

tools/build_pip_package.sh

@@ -22,7 +22,7 @@ main() {
   trap "rm -rf ${temp_dir}" EXIT
 
   # Create a virtual environment
-  python3 -m venv "${temp_dir}/venv"
+  python3.10 -m venv "${temp_dir}/venv"
   source "${temp_dir}/venv/bin/activate"
   python --version
   pip install --upgrade pip

tools/publish_pip_package.sh

@@ -22,7 +22,7 @@ main() {
   trap "rm -rf ${temp_dir}" EXIT
 
   # Create a virtual environment
-  python3 -m venv "${temp_dir}/venv"
+  python3.10 -m venv "${temp_dir}/venv"
   source "${temp_dir}/venv/bin/activate"
   python --version
   pip install --upgrade pip

tools/test_pip_package.sh

@@ -22,7 +22,7 @@ main() {
   trap "rm -rf ${temp_dir}" EXIT
 
   # Create a virtual environment
-  python3 -m venv "${temp_dir}/venv"
+  python3.10 -m venv "${temp_dir}/venv"
   source "${temp_dir}/venv/bin/activate"
   python --version
   pip install --upgrade pip