[3.13] gh-149144: Use decodeURIComponent() for UTF-8 support in js_output() (GH-149157)

(cherry picked from commit 461b1d9)

Author: StanFromIreland

Lib/http/cookies.py

@@ -388,7 +388,7 @@ def output(self, attrs=None, header="Set-Cookie:"):
     def __repr__(self):
         return '<%s: %s>' % (self.__class__.__name__, self.OutputString())
 
-   def _js_output(self, attrs=None):
+    def js_output(self, attrs=None):
         import urllib.parse
         # Print javascript
         output_string = self.OutputString(attrs)

Lib/test/test_http_cookies.py

@@ -163,7 +163,7 @@ def test_load(self):
         """)
         cookie_encoded = urllib.parse.quote('Customer="WILE_E_COYOTE"; Path=/acme', safe='', encoding='utf-8')
         self.assertEqual(C.js_output(['path']), fr"""
-        script type="text/javascript">
+        <script type="text/javascript">
         <!-- begin hiding
         document.cookie = decodeURIComponent("{cookie_encoded}");
         // end hiding -->