ci: update runner os to ubuntu 22.04

[crazy-max]

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[crazy-max]

Flaky tests with nydus build tag: https://github.com/moby/buildkit/pull/3786/files#file-client-client_test-go-L944

=== CONT  TestIntegration/TestSecurityModeSysfs/worker=containerd/secmode=insecure
    client_test.go:944: 
        	Error Trace:	/src/client/client_test.go:944
        	            				/src/util/testutil/integration/run.go:88
        	            				/src/util/testutil/integration/run.go:197
        	Error:      	Received unexpected error:
        	            	process "mkdir /sys/fs/cgroup/securitytest" did not complete successfully: exit code: 1
        	            	github.com/moby/buildkit/util/stack.Enable
        	            		/src/util/stack/stack.go:77
        	            	github.com/moby/buildkit/util/grpcerrors.FromGRPC
        	            		/src/util/grpcerrors/grpcerrors.go:198
        	            	github.com/moby/buildkit/util/grpcerrors.UnaryClientInterceptor
        	            		/src/util/grpcerrors/intercept.go:41
        	            	google.golang.org/grpc.(*ClientConn).Invoke
        	            		/src/vendor/google.golang.org/grpc/call.go:35
        	            	github.com/moby/buildkit/api/services/control.(*controlClient).Solve
        	            		/src/api/services/control/control.pb.go:2208
        	            	github.com/moby/buildkit/client.(*Client).solve.func2
        	            		/src/client/solve.go:258
        	            	golang.org/x/sync/errgroup.(*Group).Go.func1
        	            		/src/vendor/golang.org/x/sync/errgroup/errgroup.go:75
        	            	runtime.goexit
        	            		/usr/local/go/src/runtime/asm_amd64.s:1598
        	            	failed to solve
        	            	github.com/moby/buildkit/client.(*Client).solve.func2
        	            		/src/client/solve.go:273
        	            	golang.org/x/sync/errgroup.(*Group).Go.func1
        	            		/src/vendor/golang.org/x/sync/errgroup/errgroup.go:75
        	            	runtime.goexit
        	            		/usr/local/go/src/runtime/asm_amd64.s:1598
        	Test:       	TestIntegration/TestSecurityModeSysfs/worker=containerd/secmode=insecure