docs: update codesandbox templates in useDatePicker and useDateRangePicker (#7342)

Author: yihuiliao

packages/@react-aria/datepicker/docs/useDatePicker.mdx

@@ -461,13 +461,13 @@ function CalendarCell({state, date}) {
 ## Styled examples
 
 <ExampleCard
-  url="https://codesandbox.io/s/reverent-faraday-5nwk87?file=/src/DatePicker.js"
+  url="https://codesandbox.io/p/sandbox/great-dawn-s7d8th?file=/src/DatePicker.js"
   preview={tailwindExample}
   title="Tailwind CSS"
   description="A date picker built with Tailwind and React Aria." />
 
 <ExampleCard
-  url="https://codesandbox.io/s/white-breeze-rer8g2?file=/src/DatePicker.js"
+  url="https://codesandbox.io/p/sandbox/competent-tharp-zs37w9?file=/src/DatePicker.js"
   preview={chakraExample}
   title="Chakra UI"
   description="A date and time picker built with Chakra UI and React Aria." />

packages/@react-aria/datepicker/docs/useDateRangePicker.mdx

@@ -474,13 +474,13 @@ function CalendarCell({state, date}) {
 ## Styled examples
 
 <ExampleCard
-  url="https://codesandbox.io/s/reverent-faraday-5nwk87?file=/src/DateRangePicker.js"
+  url="https://codesandbox.io/p/sandbox/great-dawn-s7d8th?file=/src/DateRangePicker.js"
   preview={tailwindExample}
   title="Tailwind CSS"
   description="A date range picker built with Tailwind and React Aria." />
 
 <ExampleCard
-  url="https://codesandbox.io/s/white-breeze-rer8g2?file=/src/DateRangePicker.js"
+  url="https://codesandbox.io/p/sandbox/competent-tharp-zs37w9?file=/src/DateRangePicker.js"
   preview={chakraExample}
   title="Chakra UI"
   description="A date and time range picker built with Chakra UI and React Aria." />