CI: update Fedora 34 -> 35 (#5996)

.github/workflows/cgroup.yaml

@@ -42,7 +42,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        vm: [fedora-34]
+        vm: [fedora-35]
         mode: [unified]
       max-parallel: 1
     defaults:

tests/TESTING.md

@@ -71,7 +71,7 @@ The sub-directories therein contain fixtures for running simple clusters to asse
   - [Ubuntu 20.04](../tests/install/ubuntu-focal) (Focal Fossa)
 - [Control Groups](../tests/cgroup) :arrow_right: on any code change
   - [mode=unified](../tests/cgroup/unified) (cgroups v2)
-    - [Fedora 34](../tests/cgroup/unified/fedora-34) (rootfull + rootless)
+    - [Fedora 35](../tests/cgroup/unified/fedora-35) (rootfull + rootless)
 - [Snapshotter](../tests/snapshotter/btrfs/opensuse-leap) :arrow_right: on any code change
   - [BTRFS](../tests/snapshotter/btrfs) ([containerd built-in](https://github.com/containerd/containerd/tree/main/snapshots/btrfs))
     - [Leap 15.3](../tests/snapshotter/btrfs/opensuse-leap)

tests/cgroup/unified/fedora-34/Vagrantfile → tests/cgroup/unified/fedora-35/Vagrantfile

@@ -10,7 +10,7 @@ Vagrant.configure("2") do |config|
   config.vagrant.plugins = {
     'vagrant-k3s' => {:version => '~> 0.1.3'},
   }
-  config.vm.box = "fedora/34-cloud-base"
+  config.vm.box = "fedora/35-cloud-base"
   config.vm.boot_timeout = ENV['TEST_VM_BOOT_TIMEOUT'] || 600 # seconds
   config.vm.synced_folder '../../../../dist/artifacts', '/vagrant', type: 'rsync', disabled: false,
     rsync__exclude: ENV['RSYNC_EXCLUDE'] || '*.tar.*'