Update upstream for fmt 6.1.0

[uilianries]

Specify library name and version: fmt/6.1.0

• 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.

[conan-center-bot]

Some configurations of 'fmt/6.1.0' have failed:

• Windows x86_64, Release, Visual Studio 15, MD. Options: fmt:shared-True
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• Windows x86_64, Debug, Visual Studio 15, MDd. Options: fmt:shared-True
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[SSE4]

@uilianries it fails, pls take a look

[uilianries]

@SSE4 it's bug, our tovarishch confirmed. We will need to drop this configuration for 6.1.0

[conan-center-bot]

Some configurations of 'fmt/6.1.0' have failed:

• Windows x86_64, Debug, Visual Studio 15, MDd. Options: fmt:shared-True
  • Log download
  • Log error Download
  • Profile
• Access to all the logs
• Windows x86_64, Release, Visual Studio 15, MD. Options: fmt:shared-True
  • Log download
  • Log error Download
  • Profile
• Access to all the logs

[conan-center-bot]

All green! 😊

• fmt/5.3.0: Generated 114 packages. All logs here
• fmt/6.0.0: Generated 114 packages. All logs here
• fmt/6.1.0: Generated 110 packages. All logs here