cbc: 2.9.5 -> 2.9.9

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/clp help` got 0 exit code
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/clp version` and found version 2.9.9
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/clp help` and found version 2.9.9
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/cbc help` got 0 exit code
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/cbc version` and found version 2.9.9
- ran `/nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9/bin/cbc help` and found version 2.9.9
- found 2.9.9 with grep in /nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9
- found 2.9.9 in filename of file in /nix/store/7q93md698w3bnl212mk38rq2l6k7wav6-cbc-2.9.9