Update NuttX and NuttX Apps references to releases/12.9 in spec test workflow

Author: no1wudi

.github/workflows/spec_test_on_nuttx.yml

@@ -140,20 +140,18 @@ jobs:
             wamr_feature_option: { mode: "-G" }
 
     steps:
-      # Note: we use an unreleased version nuttx for xtensa because
-      # 12.4 doesn't contain necessary esp32s3 changes.
       - name: Checkout NuttX
         uses: actions/checkout@v4
         with:
           repository: apache/nuttx
-          ref: ${{ matrix.target_config.target == 'xtensa' && '985d395b025cf2012b22f6bb4461959fa6d87645' || 'releases/12.9' }}
+          ref: releases/12.9
           path: nuttx
 
       - name: Checkout NuttX Apps
         uses: actions/checkout@v4
         with:
           repository: apache/nuttx-apps
-          ref: ${{ matrix.target_config.target == 'xtensa' && '2ef3eb25c0cec944b13792185f7e5d5a05990d5f' || 'releases/12.9' }}
+          ref: releases/12.9
           path: apps
 
       - name: Checkout WAMR
@@ -195,7 +193,7 @@ jobs:
       - name: Install the latest esptool.py (xtensa)
         if: matrix.target_config.target == 'xtensa'
         run: |
-          pip3 install esptool==4.7.0
+          pip3 install esptool==4.8.0
           esptool.py version
 
       - name: Configure NuttX