jansson: 2.10 -> 2.11
jansson: 2.10 -> 2.11

Semi-automatic update. These checks were performed:

- built on NixOS
- found 2.11 with grep in /nix/store/pn90js1s03dg2jhpnc6sdyc2p4l0wagx-jansson-2.11
- found 2.11 in filename of file in /nix/store/pn90js1s03dg2jhpnc6sdyc2p4l0wagx-jansson-2.11

cc "@wkennington"

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