[2.x] Update virtualenv URLs to avoid blob URLs (#2775)

* [2.x] Update virtualenv URLs to avoid blob URLs

It looks like many people are hitting the HTTP 429 for old versions of cibuildwheel. These hosted versions of virtualenv should work, let's see...

* Write the correct version strings

* ci: some updates based on main branch

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: move to using latest images

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* chore: fix up style checks

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* ci: newer azure images too

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* tests: use new SSL test from main

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>

* Drop `build`'s installation from Pyodide build tools

---------

Signed-off-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Henry Schreiner <henryschreineriii@gmail.com>
Co-authored-by: Agriya Khetarpal <74401230+agriyakhetarpal@users.noreply.github.com>

test/test_ssl.py

@@ -1,25 +1,37 @@
-from __future__ import annotations
-
 import textwrap
 
+import pytest
+
 from . import test_projects, utils
 
 project_with_ssl_tests = test_projects.new_c_project(
     setup_py_add=textwrap.dedent(
         r"""
-        import ssl
+            import ssl, time, urllib.request, urllib.error
 
-        from urllib.request import urlopen
+            def check_https(context=None):
+                # google hosts this endpoint that returns a 204 No Content, it's used for
+                # connectivity checks in Android & Chrome
+                url = "https://google.com/generate_204"
 
-        context = ssl.SSLContext(ssl.PROTOCOL_TLSv1_2)
-        data = urlopen("https://www.nist.gov", context=context)
-        data = urlopen("https://raw.githubusercontent.com/pypa/cibuildwheel/main/CI.md", context=context)
-        data = urlopen("https://raw.githubusercontent.com/pypa/cibuildwheel/main/CI.md")
+                for i in range(5):
+                    try:
+                        urllib.request.urlopen(url, context=context, timeout=5)
+                        return
+                    except (OSError, urllib.error.URLError) as e:
+                        print(f"Attempt {i+1}: Could not connect to {url}: {e}")
+                        time.sleep(2 ** i)  # Backoff: 1s, 2s, 4s, 8s...
+
+                raise ConnectionError(f"Could not connect to {url} after retries.")
+
+            check_https()
+            check_https(context=ssl.SSLContext(ssl.PROTOCOL_TLSv1_2))
         """
     )
 )
 
 
+@pytest.mark.flaky(reruns=2)
 def test(tmp_path):
     # this test checks that SSL is working in the build environment using
     # some checks in setup.py.