ansifilter: 2.4 -> 2.9

Semi-automatic update. These checks were done:

- built on NixOS
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter -h` got 0 exit code
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter --help` got 0 exit code
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter help` got 0 exit code
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter -V` and found version 2.9
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter -v` and found version 2.9
- ran `/nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9/bin/ansifilter --version` and found version 2.9
- found 2.9 with grep in /nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9
- found 2.9 in filename of file in /nix/store/kws0dw1qp926cdc6msrndgq3iwp2l84a-ansifilter-2.9