Remove or update bitbucket links (GH-101963)

Since Mercurial removal from bitbucket.org, some links are broken.
They are replaced by github.com or webarchive.org links if available. Otherwise, they are removed.

Co-authored-by: Shantanu <12621235+hauntsaninja@users.noreply.github.com>

Doc/distributing/index.rst

@@ -39,8 +39,7 @@ Key terms
   developers and documentation authors responsible for the maintenance and
   evolution of the standard packaging tools and the associated metadata and
   file format standards. They maintain a variety of tools, documentation
-  and issue trackers on both `GitHub <https://github.com/pypa>`__ and
-  `Bitbucket <https://bitbucket.org/pypa/>`__.
+  and issue trackers on `GitHub <https://github.com/pypa>`__.
 * ``distutils`` is the original build and distribution system first added
   to the Python standard library in 1998. While direct use of ``distutils``
   is being phased out, it still laid the foundation for the current packaging

Doc/installing/index.rst

@@ -52,8 +52,7 @@ Key terms
   developers and documentation authors responsible for the maintenance and
   evolution of the standard packaging tools and the associated metadata and
   file format standards. They maintain a variety of tools, documentation,
-  and issue trackers on both `GitHub <https://github.com/pypa>`__ and
-  `Bitbucket <https://bitbucket.org/pypa/>`__.
+  and issue trackers on `GitHub <https://github.com/pypa>`__.
 * ``distutils`` is the original build and distribution system first added to
   the Python standard library in 1998. While direct use of ``distutils`` is
   being phased out, it still laid the foundation for the current packaging

Doc/library/venv.rst

@@ -478,7 +478,7 @@ subclass which installs setuptools and pip into a created virtual environment::
             :param context: The information for the virtual environment
                             creation request being processed.
             """
-            url = 'https://bitbucket.org/pypa/setuptools/downloads/ez_setup.py'
+            url = "https://bootstrap.pypa.io/ez_setup.py"
             self.install_script(context, 'setuptools', url)
             # clear up the setuptools archive which gets downloaded
             pred = lambda o: o.startswith('setuptools-') and o.endswith('.tar.gz')

Lib/test/test_pathlib.py

@@ -1938,7 +1938,7 @@ class _BasePathTest(object):
 
     @os_helper.skip_unless_symlink
     def test_resolve_dot(self):
-        # See https://bitbucket.org/pitrou/pathlib/issue/9/pathresolve-fails-on-complex-symlinks
+        # See http://web.archive.org/web/20200623062557/https://bitbucket.org/pitrou/pathlib/issues/9/
         p = self.cls(BASE)
         self.dirlink('.', join('0'))
         self.dirlink(os.path.join('0', '0'), join('1'))

PC/launcher.c

@@ -770,8 +770,7 @@ run_child(wchar_t * cmdline)
     window, or fetching a message).  As this launcher doesn't do this
     directly, that cursor remains even after the child process does these
     things.  We avoid that by doing a simple post+get message.
-    See http://bugs.python.org/issue17290 and
-    https://bitbucket.org/vinay.sajip/pylauncher/issue/20/busy-cursor-for-a-long-time-when-running
+    See http://bugs.python.org/issue17290
     */
     MSG msg;
 

PC/launcher2.c

@@ -2473,8 +2473,7 @@ launchEnvironment(const SearchInfo *search, const EnvironmentInfo *launch, wchar
     window, or fetching a message).  As this launcher doesn't do this
     directly, that cursor remains even after the child process does these
     things.  We avoid that by doing a simple post+get message.
-    See http://bugs.python.org/issue17290 and
-    https://bitbucket.org/vinay.sajip/pylauncher/issue/20/busy-cursor-for-a-long-time-when-running
+    See http://bugs.python.org/issue17290
     */
     MSG msg;