Install Python 3.12 in macOS tests

tink-py now supports 3.12.

PiperOrigin-RevId: 625337673
Change-Id: I0d66279227a824c593b214305f72a680692176f6

Author: morambro

kokoro/macos_external/bazel/run_tests.sh

@@ -29,10 +29,10 @@ if [[ -n "${KOKORO_ROOT:-}" ]]; then
   cd "${TINK_BASE_DIR}/tink_py"
 fi
 
-# Make sure we use the latest Python 3.11.
+# Make sure we use the latest Python 3.12 available with pyenv.
 eval "$(pyenv init -)"
-pyenv install "3.11"
-pyenv global "3.11"
+pyenv install -s "3.12"
+pyenv global "3.12"
 
 ./kokoro/testutils/copy_credentials.sh "testdata" "all"
 ./kokoro/testutils/copy_credentials.sh "examples/testdata" "gcp"

kokoro/macos_external/pip/run_tests.sh

@@ -35,10 +35,10 @@ if [[ -n "${KOKORO_ROOT:-}" ]]; then
   cd "${TINK_BASE_DIR}/tink_py"
 fi
 
-# Make sure we use the latest Python 3.11.
+# Make sure we use the latest Python 3.12 available with pyenv.
 eval "$(pyenv init -)"
-pyenv install "3.11"
-pyenv global "3.11"
+pyenv install -s "3.12"
+pyenv global "3.12"
 
 # Sourcing required to update callers environment.
 source ./kokoro/testutils/install_protoc.sh "25.1"