circle.yml: fix CI builds

Looks like https://bugzilla.redhat.com/show_bug.cgi?id=1483553 is
the key.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>

circle.yml

@@ -66,7 +66,7 @@ fedora_prep_cache: &fedora_prep_cache
   steps:
     - run:
         name: Initializing Fedora dnf cache
-        command: dnf install -y --downloadonly tree git gcc gcc-c++ meson check-devel libudev-devel libevdev-devel valgrind python3-gobject python3-evdev glib2-devel python3-lxml
+        command: dnf install -y --downloadonly libsolv tree git gcc gcc-c++ meson check-devel libudev-devel libevdev-devel valgrind python3-gobject python3-evdev glib2-devel python3-lxml
     - persist_to_workspace:
         root: /var/cache/
         paths:
@@ -79,7 +79,10 @@ fedora_fetch_cache: &fedora_fetch_cache
 fedora_install: &fedora_install
   run:
     name: Install prerequisites
-    command: dnf install -y tree git gcc gcc-c++ meson check-devel libudev-devel libevdev-devel valgrind python3-gobject python3-evdev glib2-devel python3-lxml python3-devel swig
+    command: |
+        echo keepcache=1 >> /etc/dnf/dnf.conf
+        dnf upgrade -y libsolv
+        dnf install -y tree git gcc gcc-c++ meson check-devel libudev-devel libevdev-devel valgrind python3-gobject python3-evdev glib2-devel python3-lxml python3-devel swig
 
 
 fedora_settings: &fedora_settings