Delete trailing whitespaces

Author: nametkin

Misc/NEWS.d/next/Library/2023-05-08-11-52-56.gh-issue-69152.tlH-q1.rst

@@ -1,7 +1,7 @@
 Added attribute '_raw_proxy_headers' to HTTPConnection class. This
-attribute contains the unprocessed header lines of the proxy server response 
+attribute contains the unprocessed header lines of the proxy server response
 to the CONNECT request.
 Added method get_proxy_response_headers to HTTPConnection class that allows
-to get a dictionary with headers of the proxy server response 
+to get a dictionary with headers of the proxy server response
 to the CONNECT request.
-The HTTPConnection class attribute _proxy_response_headers has been removed.
+The HTTPConnection class attribute _proxy_response_headers has been removed.