build(deps): Bump cJSON to 1.7.19

[cpswan]

Multiple bug fixes DaveGamble/cJSON@v1.7.18...v1.7.19

• Fix indentation (should use spaces), see #814
• Fix spelling errors found by CodeSpell, see #841
• Check for NULL in cJSON_DetachItemViaPointer, fixes #882, see #886
• Fix #881, check overlap before calling strcpy in cJSON_SetValuestring, see #885
• Fix #880 Max recursion depth for cJSON_Duplicate to prevent stack exhaustion, see #888
• Allocate memory for the temporary buffer when paring numbers, see #939
• fix the incorrect check in decode_array_index_from_pointer, see #957

- What I did

• Bumped cjson version and hash
• Bumped Conanfile.py and created new lock file
  • Also PR for Conan Center cjson: add version 1.7.19 conan-io/conan-center-index#28364
• Bumped version number and changelog for next release

- Description for the changelog

build(deps): Bump cJSON to 1.7.19