GA：修正开发版词库locals.js的文件日期获取方式

.github/workflows/main.user.js_version_update.yaml

@@ -48,8 +48,12 @@ jobs:
         if: |
           ${{ env.LOCALS_JS_IS_CHANGED == 'true' }}
         run: |
+          # 获取最后一次提交中`locals.js`的文件时间
+          locals_js_time=$(git log -1 --format=%at -- locals.js)
+
           # 使用`locals.js`的文件日期为词库版本号
-          locals_js_date=$(TZ='Asia/Shanghai' date -d "$(stat -c %y locals.js)" +'%Y-%m-%d')
+          locals_js_date=$(TZ='Asia/Shanghai' date -d "@$locals_js_time" +'%Y-%m-%d')
+
           sed -i -E "s/(@version\s*[0-9]+\.[0-9]+\.[0-9]+)(-[0-9]{4}-[0-9]{2}-[0-9]{2})?/\
           \1-$locals_js_date/" main.user.js
           git diff --quiet --exit-code main.user.js || \