[flatcc] fix hooks and conventions

[mathbunnyru]

Specify library name and version: lib/1.0

• I've read the guidelines for contributing.
• I've followed the PEP8 style guides for Python code in the recipes.
• I've used the latest Conan client version.
• I've tried at least one configuration locally with the
  conan-center hook activated.

[ghost]

I detected other pull requests that are modifying flatcc/all recipe:

• #3907: add component info in conanfile.py, add cmake helper module, e… #3908

This message is automatically generated by https://github.com/ericLemanissier/conan-center-conflicting-prs so don't hesitate to report issues/improvements there.

[conan-center-bot]

All green in build 1 (b10a0daf5ae00e1b3a5552df8c52d36c607ae5b0)! 😊

• flatcc/0.6.0: Generated 124 packages. All logs here