Update depdencies.

debian/changelog

@@ -1,6 +1,8 @@
 dulwich (0.20.46-1) UNRELEASED; urgency=medium
 
   * New upstream release.
+   + Drop dependency on certifi - no longer used upstream.
+   + Add build-dependency on python3-setuptools.
   * Update standards version to 4.6.1, no changes needed.
 
  -- Jelmer Vernooij <jelmer@debian.org>  Tue, 06 Sep 2022 17:59:53 +0100

debian/control

@@ -10,10 +10,10 @@ Build-Depends: debhelper-compat (= 13),
                gnupg,
                python3-all-dbg,
                python3-all-dev,
-               python3-certifi,
                python3-fastimport,
                python3-gpg,
-               python3-urllib3 (>= 1.24.1)
+               python3-urllib3 (>= 1.25),
+	       python3-setuptools
 Standards-Version: 4.6.1
 Vcs-Git: https://salsa.debian.org/python-team/packages/dulwich.git
 Vcs-Browser: https://salsa.debian.org/python-team/packages/dulwich
@@ -21,8 +21,7 @@ Rules-Requires-Root: no
 
 Package: python3-dulwich
 Architecture: any
-Depends: python3-certifi,
-         python3-urllib3 (>= 1.24.1),
+Depends: python3-urllib3 (>= 1.25),
          ${misc:Depends},
          ${python3:Depends},
          ${shlibs:Depends}