Bump oldest support libtpu version to 20230927 which includes CopyToM…

…emorySpace.

batch_device_put in libtpu will go through memory space path, and requires CopyToMemorySpace to be implemented if the backend uses memory space.

PiperOrigin-RevId: 591373300

.github/workflows/cloud-tpu-ci-nightly.yml

@@ -28,7 +28,7 @@ jobs:
         tpu-type: ["v3-8", "v4-8", "v5e-4"]
     name: "TPU test (jaxlib=${{ matrix.jaxlib-version }}, ${{ matrix.tpu-type }})"
     env:
-      LIBTPU_OLDEST_VERSION_DATE: 20230915
+      LIBTPU_OLDEST_VERSION_DATE: 20230927
       ENABLE_PJRT_COMPATIBILITY: ${{ matrix.jaxlib-version == 'nightly+oldest_supported_libtpu' }}
     runs-on: ["self-hosted", "tpu", "${{ matrix.tpu-type }}"]
     timeout-minutes: 120