thttpd: 2.27 -> 2.28
thttpd: 2.27 -> 2.28

Semi-automatic update. These checks were performed:

- built on NixOS
- ran `/nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28/bin/syslogtocern --help` got 0 exit code
- ran `/nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28/bin/syslogtocern help` got 0 exit code
- ran `/nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28/bin/syslogtocern version` and found version 2.28
- ran `/nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28/bin/syslogtocern help` and found version 2.28
- ran `/nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28/bin/thttpd -V` and found version 2.28
- found 2.28 with grep in /nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28
- found 2.28 in filename of file in /nix/store/y5ysgh6ivjgwngq37kgzlamkh91mp0qk-thttpd-2.28

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