dnf: upgrade 4.19.2 -> 4.20.0

Changelog:
==========
- Prepare man pages for switch to dnf5 as the default package manager
- Do not add user site-packages directory to sys.path
- Remove --duplicates and --oldinstallonly exit with 0 when nothing to remove
- repoquery: Fix loading filelists when -f is used
- Prepare for switch of dnf5 in Rawhide

(From OE-Core rev: 07bd7732e5d4b08f43956dc58d3d457a6707ecdc)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/dnf/dnf_4.20.0.bb

@@ -20,7 +20,7 @@ SRC_URI = "git://github.com/rpm-software-management/dnf.git;branch=master;protoc
 
 SRC_URI:append:class-native = "file://0001-dnf-write-the-log-lock-to-root.patch"
 
-SRCREV = "9b2b2e8ddab99caba4bc8059cab4263163172e81"
+SRCREV = "e3cb438c0fd08c79676c0f3276aa7d75cd8557c6"
 UPSTREAM_CHECK_GITTAGREGEX = "(?P<pver>\d+(\.\d+)+)"
 
 S = "${WORKDIR}/git"