test.pythoninfo no longer requires socket (pythonGH-93191)

test.pythoninfo no longer fails if "import socket" fails: the socket
module is now optional.
(cherry picked from commit 4a31ed8)

Co-authored-by: Victor Stinner <vstinner@python.org>

Lib/test/pythoninfo.py

@@ -543,7 +543,10 @@ def format_attr(attr, value):
 
 
 def collect_socket(info_add):
-    import socket
+    try:
+        import socket
+    except ImportError:
+        return
 
     try:
         hostname = socket.gethostname()