liblo: 0.26 -> 0.29

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/ribwnr8bbvpnr54vwhhq6c4l7qvv3ibx-liblo-0.29/bin/oscdump -h` got 0 exit code
- ran `/nix/store/ribwnr8bbvpnr54vwhhq6c4l7qvv3ibx-liblo-0.29/bin/oscdump -h` and found version 0.29
- found 0.29 with grep in /nix/store/ribwnr8bbvpnr54vwhhq6c4l7qvv3ibx-liblo-0.29
- found 0.29 in filename of file in /nix/store/ribwnr8bbvpnr54vwhhq6c4l7qvv3ibx-liblo-0.29

cc "@marcweber"