restinio: bump deps + modernize

[prince-chrismc]

Specify library name and version: lib/1.0

This is also a good place to share with all of us why you are submitting this PR (specially if it is a new addition to ConanCenter): is it a dependency of other libraries you want to package? Are you the author of the library? Thanks!

Just an everyday consumer

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• 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.

[conan-center-bot]

All green in build 1 (d3648eff777e823e34bca93859a9f9e4dfdb754f):

• restinio/0.6.8@:
  All packages built successfully! (All logs)

• restinio/0.6.8.1@:
  All packages built successfully! (All logs)

• restinio/0.6.9@:
  All packages built successfully! (All logs)

• restinio/0.6.10@:
  All packages built successfully! (All logs)

• restinio/0.6.11@:
  All packages built successfully! (All logs)

• restinio/0.6.12@:
  All packages built successfully! (All logs)

• restinio/0.6.13@:
  All packages built successfully! (All logs)

[kjetilj]

Upgrading to fmt/8.0.1 breaks this package, no longer compiles with GCC as the format strings has to be constexpr or wrapped in fmt::runtime.

[uilianries]

@kjetilj Please, open an issue reporting your error with details, including your profile and package version, steps to reproduce and log. This PR was tested using different GCC versions, from 5 to 10, and passed by all them.

[kjetilj]

Sorry, I am not familiar enough with these packages or conan to create a repro, but I can provide some more details.

It will fail with c++20 and gcc (and possibly clang), due to format now requiring the format to be parsed at compile time (https://github.com/fmtlib/fmt/releases/tag/8.0.0).

If we look at restinio it will fail to compiler here:
https://github.com/Stiffstream/restinio/blob/0052518f5692f8f051031e06d933b726191be97e/dev/restinio/message_builders.hpp#L822
format_string is not constexpr, and it changes at runtime, and that piece of code would have to be rewritten to fmt::runtime(format_string) to work with fmt/8.0.1

I also observed some additional compilation errors, but that one was the most obvious where the API of 8.0.1 is not compatible.

[prince-chrismc]

😕

You can see my pet project running this recipe revision prince-chrismc/user-management@bf5012d#diff-10e08a419e850eba1ebba18fdd28eb7ec1b7e8baa9bcc3b973e2b8891ec726be

I have never tried to build with C++20 enabled

[uilianries]

@kjetilj please, open an issue. PRs were made for patch, not discussion. This thread will be lost if followed in a PR. Besides that, this PR is closed, which means, it don't have visibility if someone is looking for the same error.

[kjetilj]

ok, I did my best here:
#7448

[uilianries]

thank you!