test: Bump up runc to 9f9c96235cc97674e935002fc3d78361b696a69e

This brings in a fix for a cgroups setup race condition
that we hit sometimes in the tests.

Signed-off-by: Mrunal Patel <mrunalp@gmail.com>

vendor/github.com/opencontainers/runc/libcontainer/keys/keyctl.go

@@ -29,7 +29,7 @@ func ModKeyringPerm(ringId KeySerial, mask, setbits uint32) error {
 		return err
 	}
 
-	res := strings.Split(string(dest), ";")
+	res := strings.Split(dest, ";")
 	if len(res) < 5 {
 		return fmt.Errorf("Destination buffer for key description is too small")
 	}