when opening a url, the proxy setting is not honored by quelpa

I have the following code in my init.el

 (setq url-using-proxy t)
 (setq url-proxy-services
   '(("http" . "myproxy.localdomain:800")
     ("https" . "myproxy.localdomain:800")))

Before updating to emacs 28 I had no problem. Since the update, quelpa will not honor this proxy setting but it will try to connect directly to the target git repository.

This is how I reproduce the bug: if I block at the firewall level any direct connection, allowing only the proxy to access the WAN side of my home network, and then I try M-X quelpa-upgrade and choose one of my packages (e.g.org-krita) I get this:

Updating /Users/cfusco/.emacs.d/quelpa/build/org-krita/
quelpa-checkout: Failed to checkout ‘org-krita’: ‘Command ’(env LC_ALL=C git fetch --tags origin)’ exited with non-zero status 128: HEAD is now at d5645b76 Update URL to Codeberg.org
'2022-05-27 01:01:43 +0200'HEAD is now at 32557af (chore)ci: /s/master/main (#2204)
'2022-05-25 11:57:17 -0700'HEAD is now at efdac6f Changed the Doom command to allow unpinning.
'2022-02-13 17:09:17 +0100'HEAD is now at 7e33495 0.2.1
'2021-05-02 11:32:57 +0530'fatal: unable to access 'https://github.com/lepisma/org-krita.git/': Failed to connect to github.com port 443 after 14 ms: Connection refused`

However, if try to download the same url with eww it works as expected as well as no error if I do a package-list-packages . These commands clearly are retrieve the urls honoring the proxy setting.

When I open back the direct access to the WAN in my home network, quelpa happily connects to the git urls, showing that the package is functioning correctly if allowed a direct access to internet.

Info about my sistem:

In GNU Emacs 28.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G95))
 of 2022-05-11 built on builder10-14.lan
Windowing system distributor 'Apple', version 10.3.1671
System Description:  Mac OS X 10.14.6

Configured using:
 'configure --with-ns '--enable-locallisppath=/Library/Application
 Support/Emacs/${version}/site-lisp:/Library/Application
 Support/Emacs/site-lisp' --with-modules'

Configured features:
ACL GMP GNUTLS JSON LIBXML2 MODULES NOTIFY KQUEUE NS PDUMPER THREADS
TOOLKIT_SCROLL_BARS ZLIB

Important settings:
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  locale-coding-system: utf-8-unix

Major mode: eww

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  transient-mark-mode: t

Load-path shadows:
/Users/cfusco/.emacs.d/elpa/transient-20220526.2152/transient hides /Applications/Emacs.app/Contents/Resources/lisp/transient
/Users/cfusco/.emacs.d/elpa/xref-1.4.1/xref hides /Applications/Emacs.app/Contents/Resources/lisp/progmodes/xref

Features:
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quelpa / quelpa

when opening a url, the proxy setting is not honored by quelpa #230