[pybind11] Version update to 2.6.1

[paulocoutinhox]

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.

[conan-center-bot]

Failure in build 1 (040e3847579d5a2922491c520a532ec9cd3ba7fd):

• pybind11/2.6.1
  • Hooks errors detected:
    • [HOOK - conan-center.py] pre_export(): ERROR: [CMAKE VERSION REQUIRED (KB-H048)] The test_package/CMakeLists.txt requires CMake 3.1 at least. Update to 'cmake_minimum_required(VERSION 3.1)'. (https://github.com/conan-io/conan-center-index/blob/master/docs/error_knowledge_base.md#KB-H048)

[conan-center-bot]

Some configurations of 'pybind11/2.6.1' failed in build 2 (9cc054faa338e1001d5204ab89d487a7041ed09d):

• Linux x86_64, Release, gcc 4.9, libstdc++
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[conan-center-bot]

Some configurations of 'pybind11/2.6.1' failed in build 4 (2199e6714cb1cf7ffb3393f4ab32d263a1c67fe8):

• Linux x86_64, Release, gcc 4.9, libstdc++
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[ghost]

I detected other pull requests that are modifying pybind11 recipe:

• Update to pybind11 2.6.0 #3305

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

[danimtb]

This PR has some conflicts