main/json-c: upgrade to 0.18

https://github.com/json-c/json-c/compare/json-c-0.17-20230812...json-c-0.18-20240915

https://github.com/json-c/json-c/compare/json-c-0.17-20230812...json-c-0.18-20240915

This could be backported to stable releases, as the 0.17 broke ABI

assigned to @ncopa

added 14 commits

• 0c85e53a...84608c7e - 13 commits from branch alpine:master
• 4f233162 - main/json-c: upgrade to 0.18

Compare with previous version

the 0.17 broke ABI

Any references?

I think i read it in the changelog.

merged