gnu: python-ldaptor: Fix build on python@3.12.

* gnu/packages/python-web.scm (python-ldaptor)[arguments]<#:phases>:
Add phase python-3.12-patch.

Change-Id: I10157ab41a5a5f78c4166a5c0a76ab9028ffd54d
Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/python-web.scm

@@ -1820,6 +1820,11 @@ reusable library for parsing, manipulating, and generating URIs.")
               "ldaptor")
       #:phases
       #~(modify-phases %standard-phases
+          (add-after 'unpack 'python-3.12-patch
+            (lambda _
+              (substitute* "ldaptor/config.py"
+                (("SafeConfigParser")
+                 "ConfigParser"))))
           (add-before 'check 'disable-failing-tests
             (lambda _
               ;; Testing with Twisted 22.4 results in infinite loop creating