Add pybind11 version 2.6.2.

[andioz]

Specify library name and version: pybind11/2.6.2

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• 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.

Fixes #4503

[conan-center-bot]

All green in build 1 (f5656cb52d00e6f76c5ac1a0704ffab5d70d2e08)! 😊

• pybind11/2.6.2: Generated 1 package. All logs here

[ghost]

I detected other pull requests that are modifying pybind11/all recipe:

• Added components to fix pybind11 #4445

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